CN112332448A - Local power grid system constructed in combination with microgrid and power supply control method - Google Patents
Local power grid system constructed in combination with microgrid and power supply control method Download PDFInfo
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- CN112332448A CN112332448A CN202011091368.5A CN202011091368A CN112332448A CN 112332448 A CN112332448 A CN 112332448A CN 202011091368 A CN202011091368 A CN 202011091368A CN 112332448 A CN112332448 A CN 112332448A
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Engineering & Computer Science (AREA)
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- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a power supply control method of a local power grid constructed in combination with a micro-grid, which is suitable for the local power grid with an energy storage unit in each micro-grid, and comprises the following steps: acquiring the load power of each microgrid in real time, and calculating the sum of the load power to be used as a main network load; comparing the main network alternating current bus power with the main network load; when the power of the main network alternating current bus is larger than that of the main network load, reducing the energy storage units in a discharging state or increasing the energy storage units in a charging state; and when the power of the main network alternating current bus is smaller than that of the main network load, the energy storage unit in a discharge state is added. According to the invention, through the arrangement of the energy storage unit, the power regulation range on the micro-grid alternating current bus in the micro-grid is more flexible and wider, and the electric energy utilization rate of the distributed power supply is improved.
Description
Technical Field
The invention relates to the technical field of micro-grids, in particular to a local power grid system constructed in combination with a micro-grid and a power supply control method.
Background
In the existing micro-grid power supply system, the power supply of the distributed power supply can be called only through micro-grid connection. However, due to load fluctuations, changes in distributed power supply output, and the like, there are still cases where the large grid power supply is insufficient or the distributed power supply output cannot be fully utilized.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a local power grid system constructed in combination with a microgrid and a power supply control method.
The invention provides a local power grid system constructed in combination with a microgrid, which comprises: a plurality of micro-grids; each micro-grid is provided with an energy storage unit, the charging end of each energy storage unit is connected with a distributed power supply in the micro-grid, and the discharging end of each energy storage unit is connected with a micro-grid alternating current bus;
charging the energy storage unit through a distributed power supply in a charging state; and the energy storage unit is used for supplying power to the microgrid alternating-current bus in a discharging state.
Preferably, the energy storage unit adopts a storage battery or a super capacitor.
A power supply control method of a local power grid constructed in combination with a microgrid comprises the following steps:
s1, acquiring the load power of each microgrid in real time, and calculating the sum of the load power to serve as a main network load;
s2, comparing the main network alternating current bus power with the main network load;
s3, when the power of the main network alternating current bus is larger than that of the main network load, reducing the energy storage units in a discharging state or increasing the energy storage units in a charging state;
and S4, when the power of the main grid alternating current bus is smaller than that of the main grid load, increasing the energy storage unit in a discharging state.
Preferably, in step S3: when the power of the main network alternating current bus is larger than that of the main network load, the energy storage units in the discharging state are quitted from the discharging state one by one.
Preferably, the specific manner of exiting the energy storage units in the discharge state one by one includes:
s31, detecting whether an energy storage unit in a discharging state exists or not;
s32, if the energy storage units in the discharge state are used as release objects, the discharge weight values corresponding to the release objects are obtained, and the discharge weight values are the difference values of the output power and the load power of the distributed power supply of the microgrid where the energy storage units are located;
and S33, the energy storage unit with the largest weight value is quitted from the discharging state, and then the step S2 is returned.
Preferably, in step S31, if there is no energy storage unit in the discharge state, the following steps are performed:
s34, acquiring the micro-grids with the energy storage units stopped discharging, and sequencing the micro-grids according to the sequence that the difference value between the output power of the distributed power supply and the load power is large or small;
s35, detecting the residual electric quantity of the energy storage units in the microgrid one by one according to the sequence until the energy storage units with the residual electric quantity smaller than the preset electric quantity upper limit value are obtained;
s36, adjusting the energy storage unit to a charging state, and then returning to the step S2.
Preferably, in step S4, the energy storage units in the discharge state are sequentially added according to the difference between the output power of the distributed power source and the load power in each microgrid.
Preferably, step S4 specifically includes the following steps:
s41, acquiring each storage battery which stops discharging, and arranging the storage batteries according to the sequence of the residual electric quantity;
and S42, switching the storage batteries to a discharging state one by one according to the sequence until the power of the main network alternating current bus is equal to the main network load.
Preferably, in step S1, the microgrid controllers detect load power in the microgrid in real time, and then the load power is summed by the main grid controllers connected to the microgrid controllers, so as to obtain the main grid load.
According to the local power grid system constructed in combination with the microgrid, disclosed by the invention, the output power of a distributed power supply in the microgrid can be reduced and the storage of redundant electric energy in the microgrid is realized by charging through the energy storage unit. Through the discharge of the energy storage unit, the dual-power supply of the microgrid alternating-current bus is realized, so that the lifting of the microgrid alternating-current bus is realized.
In the system, the energy storage unit is arranged, so that the power regulation range on the micro-grid alternating-current bus in the micro-grid is more flexible and wider, and the electric energy utilization rate of the distributed power supply is improved.
The invention provides a power supply control method of a local power grid constructed in combination with a micro-grid, wherein when the power of a main grid alternating current bus is greater than that of a main grid load, energy storage units in a discharge state are preferentially reduced, and the power of the main grid alternating current bus is reduced by reducing a power supply so as to avoid the electric quantity loss of a storage battery; if the storage battery completely exits the discharging state, the power of the main network alternating current bus is still larger than that of the main network load, the energy storage unit is used for charging, the energy supply of the distributed power supply to the micro-grid alternating current bus is reduced, the power of the main network alternating current bus is reduced, and meanwhile, the storage of redundant electric energy is realized by charging the energy storage battery.
Drawings
FIG. 1 is a partial grid system structure diagram constructed in combination with a microgrid according to the present invention;
a represents a microgrid alternating-current bus, and B represents a main network alternating-current bus;
FIG. 2 is a flow chart of a local power grid power supply control method constructed in combination with a microgrid according to the present invention;
fig. 3 is a flowchart of another local grid power supply control method constructed in association with the microgrid provided by the present invention.
Detailed Description
Referring to fig. 1, the local power grid system constructed in combination with a microgrid, provided by the invention, comprises a plurality of microgrids. Each micro-grid is provided with an energy storage unit, the charging end of each energy storage unit is connected with a distributed power supply in the micro-grid, and the discharging end of each energy storage unit is connected with a micro-grid alternating current bus.
And under the charging state of the energy storage unit, the energy storage unit is charged through the distributed power supply. Therefore, the energy storage unit is used for charging, so that the output power of the distributed power supply in the micro-grid can be reduced, and the storage of redundant electric energy in the micro-grid is realized.
And the energy storage unit is used for supplying power to the microgrid alternating-current bus in a discharging state. Therefore, the double-power-supply power supply of the microgrid alternating-current bus is realized through the discharge of the energy storage unit, so that the lifting of the microgrid alternating-current bus is realized.
Therefore, through the arrangement of the energy storage unit, in the microgrid, the power regulation range on the microgrid alternating-current bus is more flexible and wider, and the electric energy utilization rate of the distributed power supply is improved.
Specifically, in this embodiment, the energy storage unit is a storage battery or a super capacitor.
Referring to fig. 2, the present invention further provides a power supply control method for a local power grid constructed by a combined microgrid, which is suitable for the local power grid system constructed by the combined microgrid, and the method includes the following steps.
And S1, acquiring the load power of each micro-grid in real time, and calculating the sum of the load power to be used as the main grid load. In specific implementation, the microgrid controllers can be used for detecting the load power in the microgrid in real time, and then the load power is summed by the main grid controllers connected with the microgrid controllers to obtain the main grid load.
And S2, comparing the main network alternating current bus power with the main network load. Specifically, the main network alternating current bus power can be collected by arranging a sensor on the main network alternating current bus, and the main network controller compares the main network alternating current bus power with the main network load.
And S3, when the power of the main grid alternating current bus is larger than that of the main grid load, reducing the energy storage units in a discharging state or increasing the energy storage units in a charging state. During specific implementation, the energy storage units in a discharge state are preferentially reduced, and the power of the main network alternating current bus is reduced by reducing the power supply so as to avoid the electric quantity loss of the storage battery; if the storage battery completely exits the discharging state, the power of the main network alternating current bus is still larger than that of the main network load, the energy storage unit is used for charging, the energy supply of the distributed power supply to the micro-grid alternating current bus is reduced, the power of the main network alternating current bus is reduced, and meanwhile, the storage of redundant electric energy is realized by charging the energy storage battery.
Specifically, in step S3 of the present embodiment: when the power of the main network alternating current bus is larger than that of the main network load, the specific mode that the energy storage units in the discharge state exit the discharge state one by one firstly comprises the following steps:
s31, detecting whether an energy storage unit in a discharging state exists or not;
s32, if the energy storage units in the discharge state are used as release objects, the discharge weight values corresponding to the release objects are obtained, and the discharge weight values are the difference values of the output power and the load power of the distributed power supply of the microgrid where the energy storage units are located;
and S33, the energy storage unit with the largest weight value is quitted from the discharging state, and then the step S2 is returned.
Therefore, in the embodiment, the energy storage units are withdrawn one by one, so that the gradual adjustment of the whole power grid system is realized, and the voltage stability on the main grid alternating current bus is facilitated. Meanwhile, in the embodiment, the energy storage units are sequentially quitted from the discharging state according to the discharging weight values, so that the downward adjusting efficiency of the main network alternating current bus power is improved.
Specifically, in step S31, if there is no energy storage unit in the discharge state, the following steps are performed:
s34, acquiring the micro-grids with the energy storage units stopped discharging, and sequencing the micro-grids according to the sequence that the difference value between the output power of the distributed power supply and the load power is large or small;
s35, detecting the residual electric quantity of the energy storage units in the microgrid one by one according to the sequence until the energy storage units with the residual electric quantity smaller than the preset electric quantity upper limit value are obtained;
s36, adjusting the energy storage unit to a charging state, and then returning to the step S2.
So, among this embodiment, realized preferentially charging to the battery that the residual capacity is few, be favorable to avoiding partial little electric wire netting's battery residual capacity to cross lowly to through the residual capacity of battery, guarantee each little electric wire netting's anti-risk ability.
And S4, when the power of the main grid alternating current bus is smaller than that of the main grid load, increasing the energy storage unit in a discharging state. Specifically, in this step, the energy storage units in the discharge state are sequentially added according to the difference between the output power of the distributed power source in each microgrid and the load power.
The step S4 specifically includes the following steps:
s41, acquiring each storage battery which stops discharging, and arranging the storage batteries according to the sequence of the residual electric quantity;
and S42, switching the storage batteries to a discharging state one by one according to the sequence until the power of the main network alternating current bus is equal to the main network load.
So, preferentially discharge the higher battery of surplus electric quantity, be favorable to avoiding the condition of battery overdischarge to guarantee the balanced utilization of battery, guaranteed the equilibrium of each little electric wire netting through the ability that the battery independently resisted the risk.
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 (9)
1. A local grid system constructed in conjunction with a microgrid, comprising: a plurality of micro-grids; each micro-grid is provided with an energy storage unit, the charging end of each energy storage unit is connected with a distributed power supply in the micro-grid, and the discharging end of each energy storage unit is connected with a micro-grid alternating current bus;
charging the energy storage unit through a distributed power supply in a charging state; and the energy storage unit is used for supplying power to the microgrid alternating-current bus in a discharging state.
2. The local power grid system constructed in association with the microgrid of claim 1, wherein the energy storage unit adopts a storage battery or a super capacitor.
3. A power supply control method of a local power grid constructed in association with a microgrid, which is applied to the local power grid system constructed in association with the microgrid of claim 1 or 2, and is characterized by comprising the following steps:
s1, acquiring the load power of each microgrid in real time, and calculating the sum of the load power to serve as a main network load;
s2, comparing the main network alternating current bus power with the main network load;
s3, when the power of the main network alternating current bus is larger than that of the main network load, reducing the energy storage units in a discharging state or increasing the energy storage units in a charging state;
and S4, when the power of the main grid alternating current bus is smaller than that of the main grid load, increasing the energy storage unit in a discharging state.
4. A power supply control method for a local grid constructed in association with a microgrid according to claim 3, characterized in that in step S3: when the power of the main network alternating current bus is larger than that of the main network load, the energy storage units in the discharging state are quitted from the discharging state one by one.
5. The power supply control method of the local power grid constructed in combination with the microgrid according to claim 4, wherein the specific manner of gradually exiting the energy storage units in the discharge state from the discharge state comprises:
s31, detecting whether an energy storage unit in a discharging state exists or not;
s32, if the energy storage units in the discharge state are used as release objects, the discharge weight values corresponding to the release objects are obtained, and the discharge weight values are the difference values of the output power and the load power of the distributed power supply of the microgrid where the energy storage units are located;
and S33, the energy storage unit with the largest weight value is quitted from the discharging state, and then the step S2 is returned.
6. The power supply control method of the local power grid constructed in association with the microgrid according to claim 5, characterized in that in step S31, if there is no energy storage unit in a discharge state, the following steps are executed:
s34, acquiring the micro-grids with the energy storage units stopped discharging, and sequencing the micro-grids according to the sequence that the difference value between the output power of the distributed power supply and the load power is large or small;
s35, detecting the residual electric quantity of the energy storage units in the microgrid one by one according to the sequence until the energy storage units with the residual electric quantity smaller than the preset electric quantity upper limit value are obtained;
s36, adjusting the energy storage unit to a charging state, and then returning to the step S2.
7. A power supply control method for a local power grid constructed in association with a microgrid according to claim 3, characterized in that in step S4, the energy storage units in a discharge state are sequentially added according to the difference between the output power and the load power of the distributed power sources in each microgrid.
8. The power supply control method of the local power grid constructed in association with the microgrid as recited in claim 7, wherein the step S4 specifically includes the steps of:
s41, acquiring each storage battery which stops discharging, and arranging the storage batteries according to the sequence of the residual electric quantity;
and S42, switching the storage batteries to a discharging state one by one according to the sequence until the power of the main network alternating current bus is equal to the main network load.
9. A power supply control method for local power grid constructed according to claim 3, wherein in step S1, the microgrid controllers detect the load power in the microgrid in real time, and then the load power is summed by the main grid controllers connected to the microgrid controllers to obtain the main grid load.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219726A (en) * | 2013-03-29 | 2013-07-24 | 浙江大学 | Microgrid topology structure based on energy storage |
| CN103647274A (en) * | 2013-11-26 | 2014-03-19 | 中国西电电气股份有限公司 | Micro-grid system being capable of grid-connected and off-grid operation, and energy control method |
| CN104022527A (en) * | 2014-05-16 | 2014-09-03 | 国家电网公司 | DC micro grid system |
| US20140297051A1 (en) * | 2013-03-26 | 2014-10-02 | Northeastern University | Energy resource-grid-load automatic control system of smart microgrid and control methods thereof |
| CN104779634A (en) * | 2015-04-18 | 2015-07-15 | 韩少茹 | Micro-grid energy storage scheduling method |
| CN105226632A (en) * | 2015-10-30 | 2016-01-06 | 上海电力学院 | A kind of multi-mode of DC micro power grid system switches control method for coordinating |
| CN111525622A (en) * | 2020-05-29 | 2020-08-11 | 嘉兴市恒创电力设备有限公司 | Light storage and charging integrated micro-grid energy management system and method |
-
2020
- 2020-10-13 CN CN202011091368.5A patent/CN112332448A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140297051A1 (en) * | 2013-03-26 | 2014-10-02 | Northeastern University | Energy resource-grid-load automatic control system of smart microgrid and control methods thereof |
| CN103219726A (en) * | 2013-03-29 | 2013-07-24 | 浙江大学 | Microgrid topology structure based on energy storage |
| CN103647274A (en) * | 2013-11-26 | 2014-03-19 | 中国西电电气股份有限公司 | Micro-grid system being capable of grid-connected and off-grid operation, and energy control method |
| CN104022527A (en) * | 2014-05-16 | 2014-09-03 | 国家电网公司 | DC micro grid system |
| CN104779634A (en) * | 2015-04-18 | 2015-07-15 | 韩少茹 | Micro-grid energy storage scheduling method |
| CN105226632A (en) * | 2015-10-30 | 2016-01-06 | 上海电力学院 | A kind of multi-mode of DC micro power grid system switches control method for coordinating |
| CN111525622A (en) * | 2020-05-29 | 2020-08-11 | 嘉兴市恒创电力设备有限公司 | Light storage and charging integrated micro-grid energy management system and method |
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