CN114928048A - Cooperative scheduling method based on flexible interconnection of multiple regions - Google Patents
Cooperative scheduling method based on flexible interconnection of multiple regions Download PDFInfo
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- CN114928048A CN114928048A CN202210643170.6A CN202210643170A CN114928048A CN 114928048 A CN114928048 A CN 114928048A CN 202210643170 A CN202210643170 A CN 202210643170A CN 114928048 A CN114928048 A CN 114928048A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000009826 distribution Methods 0.000 claims abstract description 37
- 238000004146 energy storage Methods 0.000 claims abstract description 19
- 238000005516 engineering process Methods 0.000 claims abstract description 4
- 238000002955 isolation Methods 0.000 claims abstract description 4
- 230000001276 controlling effect Effects 0.000 claims description 13
- 238000010248 power generation Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 6
- 238000012935 Averaging Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0075—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source according to economic or energy efficiency considerations, e.g. economic dispatch
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
-
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention discloses a cooperative scheduling method based on flexible interconnection of multiple regions, which is characterized in that multiple regions are interconnected through a flexible direct current technology, dynamic capacity increase and optimized operation of a power distribution region are realized by using a cooperative control method, source-load cooperative operation of the regions is realized by controlling energy storage in the regions and converter power in a normal operation state, and when a fault occurs on an alternating current side or a low voltage side of a certain converter, the converter of the region is shut down and an alternating current side switch of the converter is disconnected to realize fault isolation; when a certain distribution transformer area alternating current high-voltage side in the interconnection system breaks down to cause transformer area alternating current loss, the loop closing system provides power supply support for the alternating current side through a fault transformer area. The invention realizes load balance and energy mutual aid among multiple intervals, improves the operation reliability, and improves the access capability and the emergency support capability of the power distribution network to large-scale new energy and electric vehicle loads.
Description
Technical Field
The invention relates to the field of intelligent power distribution networks, in particular to a cooperative scheduling method based on flexible interconnection of multiple regions.
Background
The low-voltage transformer area mostly adopts the form of single transformer and single line power supply, the reliability is lower, and each inter-area power supply is independent, and the inter-area residual capacity can not be shared, and the condition that the load rate of adjacent inter-area is unbalanced is more and more prominent along with the massive access of distributed new energy and electric automobile charging load, and the capacity resource of the distribution transformer can not be fully utilized.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a cooperative scheduling method based on flexible interconnection of multiple regions.
The technical scheme is as follows: according to the invention, a plurality of transformer areas are interconnected through a flexible direct current technology, dynamic capacity increase and optimized operation of a power distribution transformer area are realized by using a cooperative control method, and source-charge cooperative operation between the transformer areas is realized by controlling energy storage in the transformer areas and power of a current transformer in a normal operation state; when a fault occurs on the AC side or the low-voltage side of a transformer area, the transformer area is shut down and an AC side switch of the transformer area is disconnected to realize fault isolation; when the AC sides or the DC sides of two or more converters have faults, executing a loop closing system exit program, and tripping on the AC side switches of the converters in each area; when a certain distribution area AC high-voltage side in the interconnected system fails to cause the area AC loss of power, the loop closing system provides power supply support for the AC side through a failure area converter.
Further, the method for realizing inter-station source-load cooperative operation in the normal state includes the following steps:
(1) carrying out periodical rolling prediction on the photovoltaic power generation amount and the load power consumption of the transformer area;
(2) arranging energy storage charging and discharging according to the predicted photovoltaic power generation and load power utilization in a certain period;
(3) monitoring the load rate of each area of the interconnected system in real time, and starting load balancing control when a certain area is in a light load or heavy load condition;
(4) averaging the load rates of the multiple regions, and calculating a load rate balance target value;
(5) and calculating the active power of each district converter according to the load rate balance target value, and further regulating and controlling each district converter.
Further, in the step (2), if the total photovoltaic power generation of the interconnected system is larger than the total load power consumption and exceeds the limit value, arranging energy storage and charging, and distributing charging power for each district according to the SOC balance principle.
Further, in the step (2), if the total photovoltaic power generation of the interconnected system is smaller than the total load power consumption and exceeds the limit value, arranging energy storage and discharge, and distributing discharge power for the energy storage of each platform area according to the SOC balance principle.
Further, if one of the two closed rings has a fault, the converter on the side of the fault station is quitted, the converter on the normal side station operates in a single machine mode, and if one of the N (N is more than 2) closed rings has a fault, the rest N-1 closed rings operate in a networking mode again.
Further, the step of supporting the power supply with the fault on the high-voltage side comprises the following steps:
(1) when a power-off supporting instruction is received, and power-off of the low-voltage side of the distribution transformer is detected, the switch of the low-voltage side of the distribution transformer is switched off;
(2) controlling the converter to switch to a VF control mode, and performing power supply conversion on power-losing transformer areas by each transformer area according to the available capacity proportion;
(3) firstly, supplying power to a power failure platform area by using an original bus coupler switch, then controlling a synchronous device, closing the bus coupler switch and stopping the output of a converter;
(4) after the fault of the alternating current system disappears, and a superior instruction is received, the shutdown converter is restarted to be connected with the alternating current system in a grid mode, the converter is operated in a VF control mode, and then the bus tie switch is tripped;
(5) and detecting the distribution transformer low-voltage side voltage after the fault disappears, then controlling a synchronization device, closing a distribution transformer low-voltage side switch, and when the power loss support instruction is invalid, disconnecting a bus switch, closing the distribution transformer low-voltage side switch and stopping the output of the converter.
Further, the synchronization device in the step (3) is a synchronization device on two sides of the bus coupler switch.
Further, the synchronization device in the step (5) is a synchronization device on both sides of the distribution low-voltage side switch.
Has the beneficial effects that: compared with the prior art, the invention has the following remarkable advantages: the source charge optimization operation of a plurality of regions and the interconnection and mutual aid between the regions are realized through energy storage charging and discharging, a current converter mode and power adjustment, photovoltaic output adjustment and the like; the operation reliability is improved, and the access capability and the emergency supporting capability of the power distribution network to large-scale new energy and electric vehicle loads are improved.
Drawings
FIG. 1 is a schematic diagram of a multi-bay flexible interconnect system;
FIG. 2 is a flow chart of the multi-zone cooperative operation in a normal operation state;
fig. 3 is a flow chart of power supply support for a high-voltage side fault.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in fig. 1, the invention is beneficial to interconnection of a plurality of distribution areas by a flexible direct current technology, realizes dynamic capacity increase and optimized operation of the distribution areas by utilizing a cooperative control method, and improves the access capability and emergency support capability of a distribution network to new energy and electric vehicle loads.
As shown in fig. 2, in a normal operation state, photovoltaic, energy storage and load at the ac side of each distribution area are regarded as a whole to be coordinated and controlled, so that not only is energy storage in the distribution area controlled to compensate source and load total shortage power, but also source-load balance is realized between the distribution areas by controlling converter power, and maximum absorption of distributed new energy output is realized, and the control method comprises the following steps:
(1) carrying out periodical rolling prediction on the photovoltaic power generation capacity and the load power consumption of the transformer area, wherein the period is adjustable;
(2) arranging energy storage charging and discharging according to photovoltaic power generation and load power utilization in a future period, if the total photovoltaic power generation of an interconnection system is larger than the total load power utilization and exceeds a certain limit value, storing energy for charging, distributing charging power to each energy storage area according to an SOC (system on chip) balance strategy, and if the total photovoltaic power generation is smaller than the total load power utilization and exceeds a certain limit value, discharging the energy storage and distributing discharging power to each energy storage area according to SOC balance;
(3) monitoring the load rate of each area of the interconnected system in real time, and starting load balancing control when a light load or heavy load condition of a certain area occurs;
(4) averaging the load rates of the multiple zones, and calculating a load rate balance target value;
(5) and calculating an active power instruction of each zone converter according to the load rate balance target value, and regulating and controlling each zone converter.
When a system on the AC side or the low-voltage side of a transformer area has a fault, the transformer area is shut down and an AC side switch of the transformer area is disconnected to realize fault isolation, so that the normal operation of a non-fault transformer area is prevented from being influenced after the AC system of a single transformer area has the fault, if two transformer areas are closed, the transformer on the fault transformer area is withdrawn, and the transformer on the normal transformer area operates in a single-machine mode. If three or more machines are subjected to loop closing, the rest machines are subjected to network reconfiguration N-1 operation.
When the AC sides of two or more converters have faults or the DC sides have faults, the system is judged to have serious faults, a loop closing system quit program is executed, the AC side switches of the converters in each area are tripped, and potential safety hazards caused by the serious faults are prevented.
As shown in fig. 3, when a fault occurs on the ac high-voltage system side of a distribution area in the interconnection system, which results in a loss of ac power to the distribution area, the loop closing system provides power supply support to the ac side through the fault distribution area converter, and the control method includes the following steps:
(1) when a power-off support instruction is received, after power-off of the distribution transformer side is detected, the distribution transformer low-voltage side switch is disconnected;
(2) controlling the converter to switch to a VF control mode, and carrying out power transfer on power-losing transformer areas by each transformer area according to the available capacity proportion;
(3) if the original bus coupler switch is needed to supply power to the power failure area, the alternating current output frequency of the converter is controlled to be in a reasonable range, and then a synchronization device (synchronization on two sides of the bus coupler switch) is controlled to close the bus coupler switch and stop the output of the converter;
(4) if the fault of the alternating current system disappears, and after a superior instruction is received, restarting the shutdown converter to be connected with the alternating current system in a grid mode, operating in a VF control mode, and then tripping off the bus tie switch;
(5) detecting the distribution transformer low-voltage side voltage after the fault disappears, adjusting the alternating current output frequency of the converter at the side to be in a reasonable range, then controlling a synchronization device (synchronization at two sides of a distribution transformer low-voltage side switch) to close the distribution transformer low-voltage side switch, and when a power loss support instruction is invalid, disconnecting a bus switch, closing the distribution transformer low-voltage side switch and stopping the output of the converter.
Claims (8)
1. A cooperative scheduling method based on flexible interconnection of multiple regions is characterized in that: the method comprises the following steps that a plurality of transformer areas are interconnected through a flexible direct current technology, dynamic capacity increasing and optimized operation of power distribution transformer areas are achieved through a cooperative control method, and source-load cooperative operation between the transformer areas is achieved through energy storage in the transformer areas and power of a current transformer under a normal operation state; when a fault occurs on the AC side or the low-voltage side of a transformer area, the transformer area is shut down and an AC side switch of the transformer area is disconnected to realize fault isolation; when the AC sides or the DC sides of two or more converters have faults, executing a loop closing system exit program, and tripping on switches on the AC sides of the converters in each area; when a certain distribution area AC high-voltage side in the interconnected system fails to cause the area AC loss of power, the loop closing system provides power supply support for the AC side through a failure area converter.
2. The cooperative scheduling method based on flexible interconnection of multiple zones according to claim 1, wherein: the method for realizing source-load cooperative operation between the stations in the normal state comprises the following steps:
(1) carrying out periodical rolling prediction on the photovoltaic power generation amount and the load power consumption of the transformer area;
(2) arranging energy storage charging and discharging according to the predicted photovoltaic power generation and load electricity utilization in a certain period;
(3) monitoring the load rate of each area of the interconnected system in real time, and starting load balancing control when a certain area is in a light load or heavy load condition;
(4) averaging the load rates of the multiple regions, and calculating a load rate balance target value;
(5) and calculating the active power of each zone converter according to the load rate balance target value, and further regulating and controlling each zone converter.
3. The cooperative scheduling method based on flexible interconnection of multiple zones according to claim 2, wherein: and (3) if the total photovoltaic power generation of the interconnected system is greater than the total load power consumption and exceeds the limit value in the step (2), arranging energy storage and charging, and distributing charging power for the energy storage of each platform area according to the SOC balance principle.
4. The cooperative scheduling method based on flexible interconnection of multiple zones according to claim 2, wherein: and (3) if the total photovoltaic power generation of the interconnected system is smaller than the total load power consumption and exceeds the limit value in the step (2), arranging energy storage and discharge, and distributing discharge power by the energy storage of each platform area according to the SOC balance principle.
5. The cooperative scheduling method based on flexible interconnection of multiple zones according to claim 1, wherein: if one of the two closed rings has a fault, the converter on the side of the fault station is quitted, the converter on the side of the normal station runs in a single machine mode, and if one of the N (N is more than 2) closed rings has a fault, the rest N-1 closed rings are networked again.
6. The cooperative scheduling method based on flexible interconnection of multiple zones according to claim 1, wherein: the step of supporting power supply when the high-voltage side fails comprises the following steps:
(1) when a power-off supporting instruction is received, and power-off of the low-voltage side of the distribution transformer is detected, the switch of the low-voltage side of the distribution transformer is switched off;
(2) controlling the converter to switch to a VF control mode, and carrying out power transfer on power-losing transformer areas by each transformer area according to the available capacity proportion;
(3) firstly, supplying power to a power failure platform area by using an original bus coupler switch, then controlling a synchronous device, closing the bus coupler switch and stopping the output of a converter;
(4) after the fault of the alternating current system disappears, and a superior instruction is received, the shutdown converter is restarted to be connected with the alternating current system in a grid mode, the converter is operated in a VF control mode, and then the bus tie switch is tripped;
(5) and detecting the voltage of the distribution transformer low-voltage side after the fault disappears, then controlling a synchronous device, closing a distribution transformer low-voltage side switch, and when the power loss supporting instruction is invalid, disconnecting the bus coupler switch, closing the distribution transformer low-voltage side switch and stopping the output of the converter.
7. The cooperative scheduling method based on flexible interconnection of multiple zones according to claim 6, wherein: and (4) the synchronizing devices in the step (3) are synchronizing devices on two sides of the bus coupler switch.
8. The cooperative scheduling method based on flexible interconnection of multiple zones according to claim 1, wherein: and (5) the synchronization devices on two sides of the distribution transformer low-voltage side switch are used as synchronization devices.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210643170.6A CN114928048A (en) | 2022-06-08 | 2022-06-08 | Cooperative scheduling method based on flexible interconnection of multiple regions |
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| CN202210643170.6A CN114928048A (en) | 2022-06-08 | 2022-06-08 | Cooperative scheduling method based on flexible interconnection of multiple regions |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115579923A (en) * | 2022-10-18 | 2023-01-06 | 国网上海能源互联网研究院有限公司 | Energy storage optimization operation method and device for multiple scenes and multiple targets |
| CN116404683A (en) * | 2023-06-06 | 2023-07-07 | 天津市渤海新能科技有限公司 | Energy regulation and control method, device, terminal and medium of flexible-direct interconnection system |
| CN116526482A (en) * | 2023-06-19 | 2023-08-01 | 国网上海能源互联网研究院有限公司 | Grid-connected self-adaptive coordination control method and device for multi-low-voltage flexible interconnection device |
-
2022
- 2022-06-08 CN CN202210643170.6A patent/CN114928048A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115579923A (en) * | 2022-10-18 | 2023-01-06 | 国网上海能源互联网研究院有限公司 | Energy storage optimization operation method and device for multiple scenes and multiple targets |
| CN115579923B (en) * | 2022-10-18 | 2024-02-23 | 国网上海能源互联网研究院有限公司 | Energy storage optimization operation method and device for multiple scenes and multiple targets |
| CN116404683A (en) * | 2023-06-06 | 2023-07-07 | 天津市渤海新能科技有限公司 | Energy regulation and control method, device, terminal and medium of flexible-direct interconnection system |
| CN116404683B (en) * | 2023-06-06 | 2023-08-29 | 天津市渤海新能科技有限公司 | Energy regulation and control method, device, terminal and medium of flexible-direct interconnection system |
| CN116526482A (en) * | 2023-06-19 | 2023-08-01 | 国网上海能源互联网研究院有限公司 | Grid-connected self-adaptive coordination control method and device for multi-low-voltage flexible interconnection device |
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