CN112350368A - Off-grid and on-grid control method for micro-grid - Google Patents
Off-grid and on-grid control method for micro-grid Download PDFInfo
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- CN112350368A CN112350368A CN202011091344.XA CN202011091344A CN112350368A CN 112350368 A CN112350368 A CN 112350368A CN 202011091344 A CN202011091344 A CN 202011091344A CN 112350368 A CN112350368 A CN 112350368A
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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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Abstract
According to the method for controlling the off-grid and on-grid of the micro-grid, disclosed by the invention, under the grid-connected state, the output power of a micro-grid power supply and the power consumed by a load are detected in real time; and when the output power of the micro-grid power supply is consistent with the power consumed by the load, controlling the micro-grid to be off-grid. According to the method, the automatic judgment and control of the off-grid of the micro-grid are realized by comparing the output power of the micro-grid power supply with the power consumed by the load, the intellectualization and automation of the off-grid and the automation of the off-grid of the micro-grid are improved, and the reliability of the power supply of the micro-grid is further ensured.
Description
Technical Field
The invention relates to the technical field of micro-grids, in particular to a micro-grid off-grid and on-grid control method.
Background
The micro-grid is a product of popularization of electrical equipment, and stability of electricity consumption of residents is guaranteed to a great extent. The micro-grid is connected to the power grid, so that the large-scale power utilization is further scheduled, the balance of supply and demand of the large-scale power utilization is guaranteed, and the abnormal resistance of the micro-grid is improved.
However, at present, the off-grid and on-grid control of the micro-grid is too rigid, and even a plurality of micro-grids can only be manually controlled to be off-grid and on-grid, so that the working flexibility of the micro-grid is greatly reduced.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a microgrid grid-off and grid-connected control method.
According to the method for controlling the off-grid and on-grid of the micro-grid, disclosed by the invention, under the grid-connected state, the output power of a micro-grid power supply and the power consumed by a load are detected in real time;
and when the output power of the micro-grid power supply is consistent with the power consumed by the load, controlling the micro-grid to be off-grid.
Preferably, the output power and the load power consumption power of the micro-grid power supply are detected in real time in an off-grid state;
and when the output power of the micro-grid power supply is greater than the power consumed by the load, controlling the micro-grid to be connected.
Preferably, in the off-network state, when the output power of the micro-grid power supply is smaller than the load power consumption power, judging whether the large power grid can supplement the difference between the output power of the micro-grid power supply and the load power consumption power according to the current working state of the large power grid; and if so, controlling the micro-grid to be connected to the grid.
Preferably, in an off-network state, when the output power of the microgrid power supply is less than the power consumed by the load; firstly, acquiring a difference value between load power consumption power and micro-grid power supply output power as a large power grid load increment; then obtaining a difference value between the current bus power and the current load power total value of the large power grid as a power supply margin; and controlling the micro-grid to be connected according to the comparison result of the power supply margin and the load increment of the large power grid.
Preferably, when the difference value obtained by subtracting the load increment of the large power grid from the power supply margin is greater than or equal to a preset floating value of the large power grid, the micro power grid is controlled to be connected in a grid mode.
Preferably, the microgrid power supply output power and the load power consumption power are detected in real time through a microgrid controller arranged in a microgrid; the micro-grid is controlled to be off-grid or on-grid through a set main grid controller; and the main network controller is used for monitoring the working state of the large power grid in real time and is connected with each microgrid controller for data communication.
According to the microgrid grid-off and grid-connected control method provided by the invention, when the output power of the microgrid power supply is consistent with the power consumed by the load, the microgrid can be timely off-grid, so that the transmission loss of the power supply of the distributed power supply in the microgrid in a large power grid environment can be favorably avoided, the microgrid can be off-grid, the loss can be timely stopped, and the power supply waste can be avoided.
In addition, according to the invention, automatic judgment and control of the off-grid of the microgrid are realized by comparing the output power of the microgrid power supply with the power consumed by the load, the intellectualization and automation of the off-grid and the on-grid of the microgrid are improved, and the reliability of the power supply of the microgrid is further ensured.
Drawings
Fig. 1 is a flowchart of a microgrid grid-off and grid-connected control method provided by the invention;
fig. 2 is a schematic diagram of an application system of a microgrid grid-off and grid-connected control method provided by the invention.
Detailed Description
Referring to fig. 1, according to the microgrid grid-off and grid-connected control method provided by the invention, the output power and load power consumption power of a microgrid power supply are detected in real time in a grid-connected state;
and when the output power of the micro-grid power supply is consistent with the power consumed by the load, controlling the micro-grid to be off-grid.
Therefore, in the embodiment, when the output power of the micro-grid power supply is consistent with the power consumed by the load, the micro-grid power supply is timely off-grid, so that the transmission loss of the power supply of the distributed power supply in the micro-grid in the large power grid environment is favorably avoided, the micro-grid is favorably off-grid, the loss is timely stopped, and the power supply waste is avoided.
In addition, in the embodiment, by comparing the output power of the microgrid power supply with the power consumed by the load, automatic judgment and control of the off-grid and off-grid of the microgrid are realized, the intellectualization and automation of the off-grid and on-grid of the microgrid are improved, and the reliability of power supply of the microgrid is further guaranteed.
In the embodiment, the output power and the load power consumption power of the micro-grid power supply are detected in real time in an off-grid state;
and when the output power of the micro-grid power supply is greater than the power consumed by the load, controlling the micro-grid to be connected.
Therefore, by means of the micro-grid connection, the output power of the micro-grid power supply can be shared by the large power grid load, the power supply power of the micro-grid load is reduced, and the safe work of the load in the micro-grid is ensured; and the micro-grid power supply is used for supplementing the electric energy to the large power grid, so that the power supply requirement of more loads can be met. Therefore, electric energy calling is realized through a large power grid, and the balance of large-scale power supply and consumption is ensured.
In addition, in the embodiment, the automatic control of the grid connection of the micro-grid is realized by comparing the output power of the micro-grid power supply with the power consumed by the load, so that the micro-grid is fully utilized by the risk resistance characteristic of the large power grid, and the flexibility of the micro-grid in grid connection and disconnection is ensured.
In the embodiment, in an off-network state, when the output power of the micro-grid power supply is smaller than the load power consumption power, whether the large power grid can supplement the difference between the output power of the micro-grid power supply and the load power consumption power is judged according to the current working state of the large power grid; and if so, controlling the micro-grid to be connected to the grid.
Specifically, in an off-network state, when the output power of the micro-grid power supply is less than the power consumed by the load; firstly, acquiring a difference value between load power consumption power and micro-grid power supply output power as a large power grid load increment; then obtaining a difference value between the current bus power and the current load power total value of the large power grid as a power supply margin; and controlling the micro-grid to be connected according to the comparison result of the power supply margin and the load increment of the large power grid. In this embodiment, when the difference obtained by subtracting the load increment of the large power grid from the power supply margin is greater than or equal to the preset floating value of the large power grid, the micro power grid is controlled to be connected to the power grid.
Therefore, the large power grid risk resistance is evaluated by setting the large power grid floating value, so that the large power grids in different areas can flexibly adjust the large power grid floating value according to application environments and the like, and the method is more flexible and reliable in application and wider in application range.
Specifically, the microgrid grid-off and grid-connected control method in the embodiment specifically includes the following steps:
s1, acquiring the current off-grid and on-grid state of the microgrid;
in a grid-connected state, the following steps are executed:
s2, judging whether the output power of the micro-grid power supply is consistent with the power consumed by the load or not; if not, executing circularly;
s3, if yes, the microgrid is controlled to be off-grid;
under the off-grid state, the following steps are executed:
s5, comparing the output power of the microgrid power supply with the power consumed by the load;
s6, when the output power of the micro-grid power supply is larger than the power consumed by the load, controlling the micro-grid to be connected to the grid;
s7, when the output power of the microgrid power supply is equal to the power consumed by the load, returning to the step S5;
s8, when the output power of the micro-grid power supply is smaller than the power consumed by the load, acquiring the load increment and the power supply margin of the large power grid; then judging whether the difference value obtained by subtracting the load increment of the large power grid from the power supply margin is larger than or equal to a preset large power grid floating value or not, if so, controlling the micro power grid to be connected to the power grid; otherwise, the process returns to step S5.
The method in this embodiment is applicable to the power grid as shown in fig. 2, and in this embodiment, the microgrid controller arranged in the microgrid is used for detecting the output power of the microgrid power supply and the power consumed by the load in real time; the micro-grid is controlled to be off-grid or on-grid through a set main grid controller; and the main network controller is used for monitoring the working state of the large power grid in real time and is connected with each microgrid controller for data communication. In the embodiment, the microgrid power supply output power and the load power consumption power are detected in real time through the microgrid controller, so that the accuracy and real-time data acquisition of the microgrid are ensured. Meanwhile, the micro-grid is controlled to be disconnected from and connected to the grid through the main grid controller, and instant response of the disconnection and connection actions is guaranteed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (6)
1. A micro-grid off-grid and on-grid control method is characterized in that under a grid-connected state, output power and load power consumption power of a micro-grid power supply are detected in real time;
and when the output power of the micro-grid power supply is consistent with the power consumed by the load, controlling the micro-grid to be off-grid.
2. The microgrid grid-off and grid-connection control method according to claim 1, characterized in that under an off-grid state, microgrid power supply output power and load power consumption power are detected in real time;
and when the output power of the micro-grid power supply is greater than the power consumed by the load, controlling the micro-grid to be connected.
3. The microgrid grid-off and grid-connection control method according to claim 2, characterized in that in an off-grid state, when the output power of the microgrid power supply is smaller than the load power consumption power, whether the large power grid can supplement the difference between the output power of the microgrid power supply and the load power consumption power is judged according to the current working state of the large power grid; and if so, controlling the micro-grid to be connected to the grid.
4. The microgrid grid-off and grid-connection control method of claim 3, characterized in that in an off-grid state, when the output power of the microgrid power supply is less than the power consumed by a load; firstly, acquiring a difference value between load power consumption power and micro-grid power supply output power as a large power grid load increment; then obtaining a difference value between the current bus power and the current load power total value of the large power grid as a power supply margin; and controlling the micro-grid to be connected according to the comparison result of the power supply margin and the load increment of the large power grid.
5. The microgrid grid-off and grid-connection control method according to claim 4, characterized in that when a difference value obtained by subtracting a large grid load increment from a power supply margin is greater than or equal to a preset large grid floating value, the microgrid grid-connection is controlled.
6. The microgrid grid-off and grid-connection control method according to any one of claims 1 to 5, characterized in that microgrid power supply output power and load power consumption power are detected in real time by a microgrid controller arranged in a microgrid; the micro-grid is controlled to be off-grid or on-grid through a set main grid controller; and the main network controller is used for monitoring the working state of the large power grid in real time and is connected with each microgrid controller for data communication.
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| CN102170134A (en) * | 2011-05-05 | 2011-08-31 | 许继集团有限公司 | Microgrid synchronization and off-grid control method and seamless switching method |
| CN202602306U (en) * | 2012-05-29 | 2012-12-12 | 国电联合动力技术有限公司 | Grid-connected offline micro-grid system |
| CN203774835U (en) * | 2014-03-25 | 2014-08-13 | 浙江駻捷新能源科技有限公司 | Household-type micro grid system |
| CN108879780A (en) * | 2018-07-27 | 2018-11-23 | 天津津电供电设计所有限公司 | Micro-capacitance sensor is filled in grid control method, micro grid control system and light storage |
| CN111162550A (en) * | 2019-12-18 | 2020-05-15 | 安徽天尚清洁能源科技有限公司 | Micro-grid complementary power supply method through storage battery transition |
| US20200287410A1 (en) * | 2017-12-28 | 2020-09-10 | Beijing Etechwin Electric Co., Ltd. | Microgrid control system and microgrid |
-
2020
- 2020-10-13 CN CN202011091344.XA patent/CN112350368B/en active Active
Patent Citations (6)
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|---|---|---|---|---|
| CN102170134A (en) * | 2011-05-05 | 2011-08-31 | 许继集团有限公司 | Microgrid synchronization and off-grid control method and seamless switching method |
| CN202602306U (en) * | 2012-05-29 | 2012-12-12 | 国电联合动力技术有限公司 | Grid-connected offline micro-grid system |
| CN203774835U (en) * | 2014-03-25 | 2014-08-13 | 浙江駻捷新能源科技有限公司 | Household-type micro grid system |
| US20200287410A1 (en) * | 2017-12-28 | 2020-09-10 | Beijing Etechwin Electric Co., Ltd. | Microgrid control system and microgrid |
| CN108879780A (en) * | 2018-07-27 | 2018-11-23 | 天津津电供电设计所有限公司 | Micro-capacitance sensor is filled in grid control method, micro grid control system and light storage |
| CN111162550A (en) * | 2019-12-18 | 2020-05-15 | 安徽天尚清洁能源科技有限公司 | Micro-grid complementary power supply method through storage battery transition |
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Effective date of registration: 20241022 Address after: 150030, No. 61, building North Street, Xiangfang District, Heilongjiang, Harbin Applicant after: STATE GRID HEILONGJIANG ELECTRIC POWER COMPANY LIMITED, ELECTRIC POWER Research Institute Country or region after: China Applicant after: STATE GRID CORPORATION OF CHINA Address before: 241100 Building 9, Zhangzhuang standardized workshop, Anhui Xinwu Economic Development Zone, Wuhu County, Wuhu City, Anhui Province Applicant before: WUHU TAILUNTE ENERGY TECHNOLOGY Co.,Ltd. Country or region before: China |
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