CN112366738B - Little electric wire netting power storage control system of guarantee elevator power supply - Google Patents
Little electric wire netting power storage control system of guarantee elevator power supply 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
- H02J3/28—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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- 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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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Abstract
The invention provides a micro-grid power storage control system for guaranteeing elevator power supply, which comprises: the system comprises a main network controller, a large power grid alternating current bus and N micro power grids; the number M of the microgrid also comprises storage batteries, wherein M is more than or equal to 1 and less than or equal to N; acquiring electric energy from the microgrid in a charging state of the storage battery, and discharging to the microgrid alternating current bus in a discharging state; the main network controller is connected with the microgrid controller and is used for acquiring the alternating current bus power and the large power grid load of the large power grid in real time, and the large power grid load is the sum of the load power of the microgrid in a grid-connected state; and the main network controller is used for controlling the charging and discharging of each storage battery according to the comparison result of the AC bus power of the large power grid and the load of the large power grid. According to the microgrid electricity storage control system for guaranteeing the power supply of the elevator, the normal power supply of the elevator is guaranteed and the power failure risk of the elevator is avoided through the balance of the electric quantity of the large power grid, the microgrid and the storage battery.
Description
Technical Field
The invention relates to the technical field of micro-grids, in particular to a micro-grid electricity storage control system for guaranteeing elevator power supply.
Background
In modern society, electronic products are more and more abundant, and people's life is more and more unable to leave the electricity. With the increase of various electric appliances, the load of the power grid becomes heavier.
In this case, various micro grids are layered endlessly. In order to improve the risk resistance of the micro-grid, a micro-grid connection technology is developed.
The elevator is indispensable as a transportation tool of high floors in cities. In order to ensure that the elevator operates normally and is not influenced by urban power failure, the elevator must be provided with an independent power supply system. However, the independent power supply system is not only costly, but also more difficult to maintain in the event of a failure. With the introduction of the concept of distributed microgrid, elevator power supply also has a new development direction.
However, at present, when a micro-grid fails, for example, when the power supply power is insufficient, if the large grid after grid connection cannot bear the fault, the micro-grid can only leave the grid and bear the fault alone. Thus, the large power grid cannot effectively solve the fault problem of the micro power grid. Therefore, how to better solve the risk of the microgrid under the grid-connected state of the microgrid needs to be further researched.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a micro-grid electricity storage control system for ensuring elevator power supply.
The invention provides a micro-grid power storage control system for guaranteeing elevator power supply, which comprises: the system comprises a main network controller, a large power grid alternating current bus and N micro power grids;
each microgrid comprises a distributed power supply, a microgrid alternating-current bus, a microgrid controller and a load; the distributed power supply and the load are both connected with the microgrid alternating-current bus, and the microgrid alternating-current bus is also connected with the large power grid alternating-current bus through a grid-connected point switch; the microgrid controller is used for acquiring microgrid electrical parameters;
the M micro-grids further comprise storage batteries, and M is less than or equal to 1 and less than or equal to N; acquiring electric energy from the microgrid in a charging state of the storage battery, and discharging to the microgrid alternating current bus in a discharging state; the storage battery is also connected with a corresponding microgrid controller, and the microgrid controller is used for acquiring the residual electric quantity of the storage battery;
the main network controller is connected with the microgrid controller and is used for acquiring the alternating current bus power of a large power grid and the load of the large power grid in real time, and the load of the large power grid is the sum of the load power of the microgrid in a grid-connected state; and the main network controller is used for controlling the charging and discharging of each storage battery according to the comparison result of the AC bus power of the large power grid and the load of the large power grid.
Preferably, the main network controller is configured to establish a first set and a second set when the ac bus power of the large power grid is greater than the load of the large power grid, where the first set is used to store a discharge margin corresponding to each microgrid, the discharge margin is a difference between the output power and the load power of the distributed power supplies, the second set is used to store the remaining power of each storage battery and the charging efficiency of each distributed power supply corresponding to each storage battery, and the charging efficiency is inversely proportional to the distance from the distributed power supply to the storage battery in the large power grid;
and the main network controller is used for calculating the charging weight of each storage battery according to the first set and the second set when the alternating current bus power of the large power grid is greater than the load of the large power grid, and selecting the storage battery to charge by combining the charging weight of the storage battery and the residual capacity.
Preferably, the second set is denoted as:
{[C 1 ,(E 11 ,E 12 ,...E 1N )],[C 2 ,(E 21 ,E 22 ,...E 2N )],...[C M ,(E M1 ,E M2 ,...E MN )]}；
wherein, C i Indicates the residual capacity of the i-th battery, E ij And the charging efficiency of the jth distributed power supply for charging the ith storage battery is represented, i is more than or equal to 1 and less than or equal to M, and j is more than or equal to 1 and less than or equal to N.
Preferably, a calculation formula of the charging weight is preset in the main network controller:
F i ＝E i1 ×A 1 +E i2 ×A 2 +......E iN ×A N ；
wherein, F i Is the charging weight of the ith battery, E ij Represents the charging efficiency of the jth distributed power supply for charging the ith storage battery, A j And (3) representing the discharge margin of the jth distributed power supply, wherein i is more than or equal to 1 and less than or equal to M, and j is more than or equal to 1 and less than or equal to N.
Preferably, E ij ＝f/D ij Wherein f is a calculation constant, D ij And the shortest lead length from the microgrid where the jth distributed power source is located to the microgrid where the ith storage battery is located in the large power grid is represented.
Preferably, when i ≠ j, E ij Less than 1; when i = j, E ij =1; i = j indicates that the ith storage battery and the jth distributed power supply are located in the same microgrid.
Preferably, when the ac bus power of the large power grid is greater than the load of the large power grid, the main network controller is configured to obtain the storage batteries with the remaining power less than the preset threshold as charging objects, and switch the charging objects to a charging state one by one according to a sequence of charging weights from large to small until the ac bus power of the large power grid is equal to the load of the large power grid.
Preferably, the charge threshold is 50%.
Preferably, the charging end of the storage battery is connected with a distributed power supply in the microgrid, and the discharging end of the storage battery is connected with the microgrid alternating-current bus through an inverter.
Preferably, the storage battery is connected with the microgrid alternating-current bus through a bidirectional inverter.
The microgrid electricity storage control system for guaranteeing the power supply of the elevator is beneficial to improving the alternating current bus power of a large power grid by discharging of the storage battery, so that sufficient power supply of the whole large power grid is guaranteed; meanwhile, when the load of the large power grid is low, the storage battery charging can be realized through unified scheduling of the large power grid, so that the efficient utilization of the distributed power generation is ensured, and the load quantity of the large power grid is balanced through the storage battery charging, so that the balance of power supply and consumption of the large power grid is ensured, and the stable work of the large power grid is ensured. Meanwhile, the normal power supply of the elevator is ensured and the power failure risk of the elevator is avoided through the electric quantity balance of the large power grid, the micro power grid and the storage battery.
According to the invention, the charging weight simultaneously evaluates the utilization efficiency of the output electric energy of the distributed power supply and the residual electric quantity of the storage battery when the storage battery is charged. Therefore, when a charging object is selected, the balance of the residual electric quantity of the storage battery in the large power grid is ensured, and the reduction of the risk resistance of the storage battery caused by that part of the storage battery is always in a low-electric-quantity state is avoided; and the high-efficiency utilization of the output electric energy of the distributed power supply is ensured, and the energy conservation and environmental protection of a large power grid are realized.
Drawings
Fig. 1 is a structural diagram of a microgrid power storage control system for guaranteeing elevator power supply according to an embodiment;
fig. 2 is a structural diagram of a microgrid power storage control system for guaranteeing elevator power supply according to an embodiment.
A represents a microgrid alternating-current bus, and B represents a large power grid alternating-current bus.
Detailed Description
Referring to fig. 1, the microgrid power storage control system for ensuring power supply of an elevator provided by the invention comprises: the system comprises a main network controller, a large power grid alternating current bus and N micro power grids.
Each microgrid comprises a distributed power supply, a microgrid alternating-current bus, a microgrid controller and a load; the distributed power supply and the load are both connected with the microgrid alternating-current bus, and the distributed power supply supplies power to the load through the microgrid alternating-current bus in an off-grid state. The microgrid alternating-current bus is also connected with a large power grid alternating-current bus through a grid-connected point switch, and when the grid-connected point switch is disconnected, the microgrid is off; when the grid-connected point switch is closed, the micro-grid is connected to the grid so as to call the electric energy of the micro-grid through the large-grid alternating current bus and ensure the normal work of each micro-grid. The microgrid controller is used for acquiring microgrid electrical parameters, and specifically comprises distributed power supply output power, load power and the like;
the M microgrid also comprises storage batteries, and 1 is less than or equal to M and less than or equal to N. The storage battery obtains electric energy from the microgrid in a charging state, and discharges electricity to the microgrid alternating current bus in a discharging state so as to improve the voltage of the microgrid alternating current bus. The storage battery is also connected with the corresponding microgrid controller, and the microgrid controller is used for acquiring the residual electric quantity of the storage battery.
The main network controller is connected with the microgrid controller, and is used for acquiring the alternating current bus power of a large power grid and the load of the large power grid in real time, wherein the load of the large power grid is the sum of the load power of the microgrid in a grid-connected state. And the main network controller is used for controlling the charging and discharging of each storage battery according to the comparison result of the alternating current bus power of the large power grid and the load of the large power grid.
In the embodiment, under the grid-connected state, the storage battery discharges electricity, which is beneficial to improving the alternating current bus power of the large power grid, so that sufficient power supply of the whole large power grid is ensured; meanwhile, when the load of the large power grid is low, the storage battery charging can be realized through unified scheduling of the large power grid, so that the efficient utilization of the distributed power generation is ensured, and the load quantity of the large power grid is balanced through the storage battery charging, so that the balance of power supply and consumption of the large power grid is ensured, and the stable work of the large power grid is ensured.
In this embodiment, the main grid controller is configured to establish a first set and a second set when the ac bus power of the large power grid is greater than the load of the large power grid, where the first set is used to store a discharge margin corresponding to each microgrid, and the discharge margin is a difference between the output power of the distributed power supply and the load power. Specifically, when the output power of the distributed power supply is greater than the load power, the discharge margin is a positive number; and when the output power of the distributed power supply is smaller than the load power, the discharge margin is negative.
The second set is used for storing the residual electric quantity of each storage battery and the charging efficiency of each storage battery corresponding to each distributed power supply, and the charging efficiency is inversely proportional to the distance of each distributed power supply from each storage battery in the large power grid. Specifically, in the present embodiment, the distance from the storage battery to the distributed power supply in the large power grid is the shortest lead length between the microgrid where the distributed power supply is located and the microgrid where the storage battery is located.
Specifically, in the present embodiment, the second set is denoted as:
{[C 1 ,(E 11 ,E 12 ,...E 1N )],[C 2 ,(E 21 ,E 22 ,...E 2N )],...[C M ,(E M1 ,E M2 ,...E MN )]}；
wherein, C i Indicates the residual capacity of the i-th battery, E ij And the charging efficiency of the jth distributed power supply for charging the ith storage battery is represented, i is more than or equal to 1 and less than or equal to M, and j is more than or equal to 1 and less than or equal to N.
In the present embodiment, E ij ＝f/D ij Wherein f is a calculation constant, D ij And the shortest lead length from the microgrid where the jth distributed power source is located to the microgrid where the ith storage battery is located in the large power grid is represented.
Specifically, in the present embodiment, when i ≠ j, E ij Less than 1; when i = j, E ij =1; i = j indicates that the ith storage battery and the jth distributed power supply are located in the same microgrid.
And the main network controller is used for calculating the charging weight of each storage battery according to the first set and the second set when the alternating current bus power of the large power grid is greater than the load of the large power grid, and selecting the storage battery to charge by combining the charging weight of the storage battery and the residual capacity.
Specifically, a calculation formula of the charging weight is preset in the main network controller:
F i ＝E i1 ×A 1 +E i2 ×A 2 +......E iN ×A N ；
wherein, F i Charging weight for the ith accumulator, E ij Represents the charging efficiency of the jth distributed power supply for charging the ith storage battery, A j And (3) representing the discharge margin of the jth distributed power supply, wherein i is more than or equal to 1 and less than or equal to M, and j is more than or equal to 1 and less than or equal to N.
In this embodiment, in the second group, E ij The main network controller calculates and stores the preset value according to the distance between the micro-grids in the grid-connected state, so that the charging efficiency can be directly called when the charging weight is calculated, and the calculation efficiency of the charging weight is improved; c i And the real-time value is updated by the main network controller in real time according to the data uploaded by the microgrid controller.
In this embodiment, when the ac bus power of the large power grid is greater than the load of the large power grid, the main network controller is configured to obtain the storage batteries with the remaining power less than the preset power threshold as charging targets, and switch the charging targets to a charging state one by one according to the sequence of the charging weights from large to small until the ac bus power of the large power grid is equal to the load of the large power grid. In particular, the threshold value of the electric quantity may be set to 50%.
Specifically, in this embodiment, the specific manner in which the master network controller switches the charging target to the charging state is that the microgrid controller corresponding to the charging target under the master network controller issues a charging command, and the microgrid controller controls the charging target to adjust to the charging state.
In this embodiment, the charging weight simultaneously evaluates the utilization efficiency of the output electric energy of the distributed power supply and the remaining capacity of the storage battery when the storage battery is charged. Therefore, when a charging object is selected, the balance of the residual electric quantity of the storage battery in the large power grid is ensured, and the reduction of the risk resistance of the storage battery caused by that part of the storage battery is always in a low-electric-quantity state is avoided; and the high-efficiency utilization of the output electric energy of the distributed power supply is ensured, and the energy conservation and environmental protection of a large power grid are realized.
The above system is further explained below in connection with two specific embodiments.
In the first embodiment, the charging end of the storage battery is connected with a distributed power supply in the microgrid, and the discharging end is connected with the microgrid alternating-current bus through an inverter.
Referring to fig. 2, in this embodiment, in the state of charging the storage battery, the storage battery is directly charged by the distributed power supply in the same microgrid, so that the power transmitted by the distributed power supply to the ac bus of the microgrid is reduced, and an effect of balancing power supply and consumption of the large power grid is achieved by reducing the output power from the distributed power supply to the large power grid under the condition that the load of the large power grid is not changed. In this embodiment, directly charge for the battery through distributed power source, be favorable to improving battery charging efficiency to reduce battery charging loss.
In this embodiment, the specific manner for the master network controller to switch the charging object to the charging state is as follows: and the microgrid controller controls the connection between the charging end of the storage battery and the distributed power supply to be switched from a disconnected state to a connected state according to a charging instruction issued by the main network controller. Specifically, a switch may be provided between the charging terminal of the storage battery and the distributed power supply, and the storage battery is charged by the microgrid controller according to the on/off of the switch.
In the second embodiment, the storage battery is connected with the microgrid alternating-current bus through the bidirectional inverter.
Referring to fig. 2, in this embodiment, when the storage battery is charged, the storage battery is regarded as a load, so that power supply and consumption balance of a large power grid is realized in a manner that a load of the large power grid is increased under the condition that output power of a distributed power source in the large power grid is not changed. In this embodiment, the output power of the distributed power supply in the large power grid is not changed, which is beneficial to ensuring the stable operation of the large power grid.
In this embodiment, the specific manner for the master network controller to switch the charging object to the charging state is as follows: and the microgrid controller controls the bidirectional inverter to adjust to a charging state according to a charging instruction issued by the main network controller, so that the storage battery is charged.
The above description is only for the preferred embodiments 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 as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (4)
1. The utility model provides a guarantee microgrid electric power storage control system of elevator power supply which characterized in that includes: the system comprises a main network controller, a large power grid alternating current bus and N micro power grids;
each microgrid comprises a distributed power supply, a microgrid alternating-current bus, a microgrid controller and a load; the distributed power supply and the load are both connected with the microgrid alternating-current bus, and the microgrid alternating-current bus is also connected with the large power grid alternating-current bus through a grid-connected point switch; the microgrid controller is used for acquiring microgrid electrical parameters;
wherein, M micro-grids also comprise storage batteries, and M is more than or equal to 1 and less than or equal to N; acquiring electric energy from the microgrid in a charging state of the storage battery, and discharging to the microgrid alternating current bus in a discharging state; the storage battery is also connected with a corresponding microgrid controller, and the microgrid controller is used for acquiring the residual electric quantity of the storage battery;
the main network controller is connected with the microgrid controller and is used for acquiring the alternating current bus power and the large power grid load of the large power grid in real time, and the large power grid load is the sum of the load power of the microgrid in a grid-connected state; the main network controller is used for controlling the charging and discharging of each storage battery according to the comparison result of the alternating current bus power of the large power grid and the load of the large power grid;
the main network controller is used for establishing a first set and a second set when the AC bus power of the large power grid is greater than the load of the large power grid, the first set is used for storing a discharge margin corresponding to each micro power grid, the discharge margin is the difference between the output power and the load power of the distributed power supplies, the second set is used for storing the residual electric quantity of each storage battery and the charging efficiency of each distributed power supply corresponding to each storage battery, and the charging efficiency is in inverse proportion to the distance between the distributed power supply and the storage battery in the large power grid;
the main network controller is used for calculating the charging weight of each storage battery according to the first set and the second set when the alternating current bus power of the large power grid is greater than the load of the large power grid, and selecting the storage battery to charge by combining the charging weight of the storage battery and the residual electric quantity;
the second set is denoted as:
{[C 1 ,(E 11 ,E 12 ,...E 1N )],[C 2 ,(E 21 ,E 22 ,...E 2N )],...[C M ,(E M1 ,E M2 ,...E MN )]}；
wherein, C i Indicates the residual capacity of the i-th battery, E ij The charging efficiency of the jth distributed power supply for charging the ith storage battery is represented, i is more than or equal to 1 and less than or equal to M, and j is more than or equal to 1 and less than or equal to N;
a calculation formula of the charging weight is preset in the main network controller:
F i ＝E i1 ×A 1 +E i2 ×A 2 +......E iN ×A N ；
wherein, F i Is the charging weight of the ith battery, E ij Represents the charging efficiency of the jth distributed power supply for charging the ith storage battery, A j Representing the discharge margin of the jth distributed power supply, wherein i is more than or equal to 1 and less than or equal to M, and j is more than or equal to 1 and less than or equal to N;
E ij ＝fD ij wherein f is a calculation constant, D ij The shortest lead length from the microgrid where the jth distributed power source is located to the microgrid where the ith storage battery is located in the large power grid is represented;
when i ≠ j, E ij Less than 1; when i = j, E ij =1; i = j indicates that the ith storage battery and the jth distributed power supply are located in the same microgrid;
when the alternating-current bus power of the large power grid is larger than the load of the large power grid, the main network controller is used for acquiring the storage batteries with the residual electric quantity smaller than a preset electric quantity threshold value as charging objects and switching the charging objects to a charging state one by one according to the sequence of charging weights from large to small until the alternating-current bus power of the large power grid is equal to the load of the large power grid.
2. The microgrid electricity storage control system for ensuring elevator power supply of claim 1, wherein the electricity threshold is 50%.
3. The microgrid power storage control system for guaranteeing elevator power supply of any one of claims 1 to 2, wherein a charging end of the storage battery is connected with a distributed power supply in the microgrid, and a discharging end of the storage battery is connected with a microgrid alternating-current bus through an inverter.
4. The microgrid power storage control system for ensuring power supply of an elevator as claimed in any one of claims 1 to 3, wherein the storage battery is connected with a microgrid alternating current bus through a bidirectional inverter.
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Denomination of invention: A Microgrid Energy Storage Control System for Ensuring Elevator Power Supply Granted publication date: 20230314 Pledgee: Hefei high tech Company limited by guarantee Pledgor: ANHUI ORIOC TECHNOLOGY CO.,LTD. Registration number: Y2024980021928 |