CN111130131B - Double-bus micro-grid complementary power supply system - Google Patents
Double-bus micro-grid complementary power supply system Download PDFInfo
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- CN111130131B CN111130131B CN201911308197.4A CN201911308197A CN111130131B CN 111130131 B CN111130131 B CN 111130131B CN 201911308197 A CN201911308197 A CN 201911308197A CN 111130131 B CN111130131 B CN 111130131B
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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
- H02J3/28—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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Abstract
The invention provides a double-bus micro-grid complementary power supply system, which comprises: the energy storage charging system comprises an energy storage charging bus, an energy storage discharging bus, at least two energy storage modules, a main controller and a plurality of micro-grids; each grid-connected module is provided with a common end, a first static end and a second static end; each micro-grid and each energy storage module are respectively connected with a public end of a corresponding grid-connected module and are connected with each other, a first static end and a second static end of the grid-connected module are respectively connected with an energy storage charging bus and an energy storage discharging bus, and the micro-grid and the energy storage module are respectively selected to be communicated with the energy storage charging bus or the energy storage discharging bus through the corresponding grid-connected module. According to the invention, through the arrangement of the energy storage charging bus and the energy storage discharging bus, the energy storage module is used as the electric energy transition transfer station, and the grouping of the microgrid with unbalanced power consumption is realized, so that the unidirectional electric energy transmission between the microgrid and the energy storage unit in the large power grid is realized, the many-to-many electric energy transmission mode is avoided, the grid-connected loss and the voltage disturbance risk of the microgrid are reduced, the electric energy loss is favorably reduced, and the working reliability of the microgrid is improved.
Description
Technical Field
The invention relates to the technical field of micro-grids, in particular to a double-bus micro-grid complementary power supply system.
Background
The micro-grid aims to realize flexible and efficient application of distributed power supplies and solve the problem of grid connection of the distributed power supplies which are large in quantity and various in forms [1 ]. The development and extension of the micro-grid can fully promote the large-scale access of distributed power sources and renewable energy sources, realize the high-reliability supply of various energy source types of loads, and is an effective mode for realizing an active power distribution network, so that the traditional power grid is transited to a smart power grid.
However, in the existing microgrid grid-connection technology, a many-to-many electric energy scheduling mode among the microgrids is adopted in a grid-connection state, grid-connection loss is large, voltage disturbance is large in the grid-connection process, and stable work of the microgrid is not facilitated.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a double-bus micro-grid complementary power supply system.
The invention provides a double-bus micro-grid complementary power supply system, which comprises: the energy storage charging system comprises an energy storage charging bus, an energy storage discharging bus, at least two energy storage modules, a main controller and a plurality of micro-grids;
each grid-connected module is provided with a common end, a first static end and a second static end; each micro-grid and each energy storage module are respectively connected with a public end of a corresponding grid-connected module, a first static end and a second static end of the grid-connected module are respectively connected with an energy storage charging bus and an energy storage discharging bus, and the micro-grid and the energy storage module are respectively selected to be communicated with the energy storage charging bus or the energy storage discharging bus through the corresponding grid-connected module; a bidirectional inverter is connected in series between each energy storage unit and the corresponding grid-connected module;
the main controller is respectively connected with each grid-connected module and each bidirectional inverter, and is used for controlling each microgrid connected with the energy storage charging bus to charge the energy storage modules connected with the energy storage charging bus through the corresponding bidirectional inverters according to the working state of each grid-connected module, and controlling the energy storage modules connected with the energy storage discharging bus to supply power to each microgrid connected with the energy storage discharging bus through the corresponding bidirectional inverters.
Preferably, the main controller is further connected with a microgrid controller included in each microgrid, and the microgrid controller acquires that the power supply power is greater than the total power consumption power in the microgrid and records the acquired microgrid as an over-supply microgrid and acquires that the power supply power is greater than the total power consumption power in the microgrid and records the acquired microgrid as an under-supply microgrid according to the comparison result of the power supply power of the microgrid and the total power consumption power in the microgrid; the main controller is used for controlling the over-supply micro-grid to be connected with the energy storage charging bus through the corresponding grid-connected module and controlling the under-supply micro-grid to be connected with the energy storage discharging bus.
Preferably, the main controller is further connected with each energy storage module, a discharging sequence and a charging sequence are arranged in the controller, the discharging sequence is used for storing the energy storage modules to be discharged, and the charging sequence is used for storing the energy storage modules to be charged;
the main controller is used for selecting at least one energy storage module from the charging sequence to be connected to the energy storage charging bus according to the residual power on the energy storage charging bus and selecting at least one energy storage module from the discharging sequence to be connected to the energy storage discharging bus according to the credit power on the energy storage discharging bus;
the residual power is the difference value obtained by subtracting the sum of the consumed power from the sum of the power supply power of all the micro-grids connected with the energy storage charging bus; the credit power is the difference value of the sum of the power consumption power of all micro-grids connected with the energy storage discharge bus minus the sum of the power supply power.
Preferably, the number of energy storage modules is at least 5.
Preferably, the main controller is used for detecting the residual electric quantity of each energy storage module in real time, and for inserting the energy storage modules with the residual electric quantity larger than a preset first electric quantity into a discharging sequence, and for inserting the energy storage modules with the residual electric quantity smaller than a preset second electric quantity into a charging sequence; the first and second electrical quantities are both constant, and the second electrical quantity is less than the first electrical quantity.
Preferably, the second amount of power is less than half of the first amount of power, and the first amount of power is greater than 90%.
Preferably, the main controller is further connected with each energy storage module respectively, and the main controller is used for controlling the energy storage modules to be disconnected from the energy storage charging bus when the residual electric quantity of the energy storage modules connected with the energy storage charging bus reaches a preset charging upper limit value, and reselecting the energy storage module with the minimum residual electric quantity to be connected to the energy storage charging bus;
the main controller is used for controlling the energy storage module to be disconnected with the energy storage discharging bus when the residual electric quantity of the energy storage module connected with the energy storage discharging bus reaches a preset discharging lower limit value, and reselecting the energy storage module with the maximum residual electric quantity to be connected into the energy storage discharging bus.
Preferably, each grid-connected module is provided with a common end, a first static end and a second static end; the first static end of each grid-connected module is connected with an energy storage charging bus, and the second static end of each grid-connected module is connected with an energy storage discharging bus; each micro-grid, the first energy storage module and the second energy storage module are respectively connected with the public end of the corresponding grid-connected module; each grid-connected module has three states of disconnection, conduction of the public end and the first static end or conduction of the public end and the second static end.
Preferably, the energy storage module adopts a storage battery or a super capacitor.
According to the double-bus microgrid complementary power supply system, a microgrid for supplying power to the outside and a microgrid for drawing electric energy from the outside are separated through the energy storage charging bus and the energy storage discharging bus, so that redundant electric energy generated by the microgrid with a supply size larger than a demand is transmitted to the energy storage module for storage through the energy storage charging bus, electric energy stored by the energy storage module is transmitted to the microgrid with a supply size smaller than the demand through the energy storage discharging bus for power supply compensation, and normal work of each power consumption device in the microgrid is guaranteed.
Therefore, the storage and utilization of the redundant electric energy of the micro-grid are realized through the arrangement of the energy storage module, and the complementation of power supply and power consumption among different micro-grids is realized. In addition, the energy storage module is used as the electric energy transition transfer station through the arrangement of the energy storage charging bus and the energy storage discharging bus, so that the grouping of the micro-grid with unbalanced power consumption is realized, the one-way electric energy transmission between the micro-grid and the energy storage unit in the large power grid is realized, the many-to-many electric energy transmission mode is avoided, the grid-connected loss and the voltage disturbance risk of the micro-grid are reduced, the electric energy loss is favorably reduced, and the working reliability of the micro-grid is improved.
Drawings
Fig. 1 is a schematic diagram of a double-bus micro-grid complementary power supply system according to the present invention.
Detailed Description
Referring to fig. 1, the present invention provides a double-bus micro-grid complementary power supply system, including: the energy storage charging system comprises an energy storage charging bus, an energy storage discharging bus, at least two energy storage modules, a main controller and a plurality of micro-grids.
Each grid-connected module is provided with a common end, a first static end and a second static end; each micro-grid and each energy storage module are respectively connected with a public end of a corresponding grid-connected module and are connected with each other, a first static end and a second static end of the grid-connected module are respectively connected with an energy storage charging bus and an energy storage discharging bus, and the micro-grid and the energy storage module are respectively selected to be communicated with the energy storage charging bus or the energy storage discharging bus through the corresponding grid-connected module. And a bidirectional inverter is connected in series between each energy storage unit and the corresponding grid-connected module. Specifically, in this embodiment, the energy storage module is a storage battery or a super capacitor.
The main controller is respectively connected with each grid-connected module and each bidirectional inverter, and is used for controlling each microgrid connected with the energy storage charging bus to charge the energy storage modules connected with the energy storage charging bus through the corresponding bidirectional inverters according to the working state of each grid-connected module, and controlling the energy storage modules connected with the energy storage discharging bus to supply power to each microgrid connected with the energy storage discharging bus through the corresponding bidirectional inverters.
So, in this embodiment, the microgrid that will supply power to the outside and draw the electric energy from the outside is separated through energy storage charging bus and energy storage discharging bus, has realized that the unnecessary electric energy that produces the microgrid that supplies more than asking passes through energy storage charging bus and transmits to energy storage module and save to the electric energy of energy storage module storage transmits the microgrid that supplies less than asking through energy storage discharging bus and supplies power compensation, in order to guarantee the normal work of each power consumptive equipment in the microgrid.
Therefore, in the embodiment, the storage and utilization of the redundant electric energy of the micro-grid are realized through the arrangement of the energy storage module, and the complementation of power supply and power consumption among different micro-grids is realized. In addition, in the embodiment, by arranging the energy storage charging bus and the energy storage discharging bus and using the energy storage module as the electric energy transition transfer station, grouping of the microgrid with unbalanced power consumption is realized, so that unidirectional electric energy transmission between the microgrid and the energy storage unit in the large power grid is realized, a many-to-many electric energy transmission mode is avoided, grid connection loss and voltage disturbance risk of the microgrid are reduced, electric energy loss is reduced, and the working reliability of the microgrid is improved.
Specifically, in this embodiment, the main controller is further connected to a microgrid controller included in each microgrid, and acquires a microgrid having a supply power greater than the total power consumption in the microgrid as an over-supply microgrid and acquires a microgrid having a supply power greater than the total power consumption in the microgrid as an under-supply microgrid according to a comparison result between the supply power of the microgrid and the total power consumption in the microgrid. The main controller is used for controlling the over-supply micro-grid to be connected with the energy storage charging bus through the corresponding grid-connected module and controlling the under-supply micro-grid to be connected with the energy storage discharging bus. Therefore, the main controller realizes implementation control of the power consumption balance state in each microgrid through real-time communication with the microgrid controller, and therefore real-time maintenance of the power consumption balance of each microgrid is realized and the reliability of the work of the microgrid is guaranteed by adjusting the conduction of the microgrid and the energy storage charging bus and the energy storage discharging bus.
In this embodiment, the main controller is further connected to each energy storage module, a discharging sequence and a charging sequence are arranged in the controller, the discharging sequence is used for storing the energy storage modules to be discharged, and the charging sequence is used for storing the energy storage modules to be charged. The main controller is used for selecting at least one energy storage module from the charging sequence to be connected to the energy storage charging bus according to the residual power on the energy storage charging bus and selecting at least one energy storage module from the discharging sequence to be connected to the energy storage discharging bus according to the credit power on the energy storage discharging bus.
The residual power is the difference value of the sum of the power supply power and the sum of the power consumption power of all the micro-grids connected with the energy storage charging bus. The credit power is the difference value of the sum of the power consumption power of all micro-grids connected with the energy storage discharge bus minus the sum of the power supply power.
In this embodiment, the main controller module is configured to ensure that the energy storage charging bus is connected with at least one energy storage module when the energy storage charging bus is connected with the microgrid; meanwhile, when the micro-grid is connected to the energy storage discharge bus, at least one energy storage module is connected to the energy storage discharge bus, so that power consumption balance on the energy storage charge bus and the energy storage discharge bus is guaranteed.
In the embodiment, the energy storage modules are conveniently classified by the main controller in advance through the arrangement of the discharging sequence and the charging sequence, so that the energy storage modules are rapidly selected from the discharging sequence and the charging sequence to be connected to the energy storage discharging bus and the energy storage charging bus respectively when needed.
Specifically, in this embodiment, the higher the remaining power is, the more energy storage modules are connected to the energy storage charging bus; meanwhile, the larger the credit power is, the more the number of the energy storage modules connected to the energy storage discharge bus is.
In this embodiment, the number of energy storage modules is at least 5 to ensure margins in the discharging sequence and the charging sequence.
In this embodiment, the main controller is further configured to detect the remaining power of each energy storage module in real time, and to enter the discharging sequence into the energy storage module with the remaining power greater than the preset first power, and to enter the charging sequence into the energy storage module with the remaining power less than the preset second power. The first and second electrical quantities are both constant, and the second electrical quantity is less than the first electrical quantity. Further, the second amount of power is less than half of the first amount of power, and the first amount of power is greater than 90%.
During specific implementation, the main controller is further connected with each energy storage module to acquire the residual electric quantity of each energy storage module in real time. The main controller is also used for disconnecting the energy storage module from the energy storage charging bus and moving the energy storage module into a discharging sequence when the residual electric quantity of each energy storage module connected to the energy storage charging bus reaches a preset energy storage upper limit; the main controller is also used for disconnecting the energy storage module from the energy storage discharge bus and moving the energy storage module into a charging sequence when the residual electric quantity of each energy storage module connected to the energy storage discharge bus reaches a preset energy storage lower limit. Specifically, the lower energy storage limit is smaller than the second electric quantity, and the upper energy storage limit is larger than the first electric quantity. In specific implementation, the upper limit of the stored energy may be 100%, the lower limit of the stored energy may be 1%, the second electric quantity may be 20%, and the first electric quantity may be 70%.
When the energy storage charging bus is implemented specifically, the energy storage charging bus can be further provided, the main controller is respectively connected with the energy storage modules, and the main controller is used for controlling the energy storage modules to be disconnected with the energy storage charging bus when the residual electric quantity of the energy storage modules connected with the energy storage charging bus reaches a preset charging upper limit value, and reselecting the energy storage module with the minimum residual electric quantity to be connected with the energy storage charging bus. The main controller is also used for controlling the energy storage module to be disconnected with the energy storage discharging bus when the residual electric quantity of the energy storage module connected with the energy storage discharging bus reaches a preset discharging lower limit value, and reselecting the energy storage module with the maximum residual electric quantity to be connected into the energy storage discharging bus. The upper limit value of charge is larger than the lower limit value of discharge, the upper limit value of charge is 100%, and the lower limit value of discharge is 10%.
In this embodiment, each grid-connected module is provided with a common terminal, a first stationary terminal and a second stationary terminal. And the first static end of each grid-connected module is connected with an energy storage charging bus, and the second static end of each grid-connected module is connected with an energy storage discharging bus. Each micro-grid, the first energy storage module and the second energy storage module are respectively connected with the public end of the corresponding grid-connected module. Each grid-connected module has three states of disconnection, conduction of the public end and the first static end or conduction of the public end and the second static end. Specifically, when the grid-connected module is disconnected, the corresponding micro-grid or energy storage module is in an off-grid state; when the common end of the grid-connected module is conducted with the first static end, the corresponding micro-grid or energy storage module is connected to the energy storage charging bus; when the common end of the grid-connected module is conducted with the second static end, the corresponding micro-grid or energy storage module is connected to the energy storage discharge bus.
Specifically, in the present invention, the upper energy storage limit, the lower energy storage limit, the second electric quantity, the first electric quantity, the upper charge limit, and the lower discharge limit are all states of charge.
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 (7)
1. A double-bus micro-grid complementary power supply system is characterized by comprising: the energy storage charging system comprises an energy storage charging bus, an energy storage discharging bus, at least two energy storage modules, a main controller and a plurality of micro-grids;
each grid-connected module is provided with a common end, a first static end and a second static end; each micro-grid and each energy storage module are respectively connected with a public end of a corresponding grid-connected module, a first static end and a second static end of the grid-connected module are respectively connected with an energy storage charging bus and an energy storage discharging bus, and the micro-grid and the energy storage module are respectively selected to be communicated with the energy storage charging bus or the energy storage discharging bus through the corresponding grid-connected module; a bidirectional inverter is connected in series between each energy storage unit and the corresponding grid-connected module;
the main controller is respectively connected with each grid-connected module and each bidirectional inverter and is used for controlling each microgrid connected with the energy storage charging bus to charge the energy storage modules connected with the energy storage charging bus through the corresponding bidirectional inverters according to the working state of each grid-connected module and controlling the energy storage modules connected with the energy storage discharging bus to supply power to each microgrid connected with the energy storage discharging bus through the corresponding bidirectional inverters;
the main controller is also connected with a microgrid controller contained in each microgrid, and acquires the microgrid with the power supply power greater than the total power consumption power in the microgrid and records the microgrid as an over-supply microgrid and acquires the microgrid with the power supply power greater than the total power consumption power in the microgrid and records the microgrid as an under-supply microgrid according to the comparison result of the power supply power of the microgrid and the total power consumption power in the microgrid; the main controller is used for controlling the over-supply micro-grid to be connected with the energy storage charging bus through the corresponding grid-connected module and controlling the under-supply micro-grid to be connected with the energy storage discharging bus;
the main controller is also respectively connected with the energy storage modules, a discharging sequence and a charging sequence are arranged in the controller, the discharging sequence is used for storing the energy storage modules to be discharged, and the charging sequence is used for storing the energy storage modules to be charged;
the main controller is used for selecting at least one energy storage module from the charging sequence to be connected to the energy storage charging bus according to the residual power on the energy storage charging bus and selecting at least one energy storage module from the discharging sequence to be connected to the energy storage discharging bus according to the credit power on the energy storage discharging bus;
the residual power is the difference value obtained by subtracting the sum of the consumed power from the sum of the power supply power of all the micro-grids connected with the energy storage charging bus; the credit power is the difference value of the sum of the power consumption power of all micro-grids connected with the energy storage discharge bus minus the sum of the power supply power.
2. The dual bus microgrid complementary power supply system of claim 1, wherein the number of energy storage modules is at least 5.
3. The complementary power supply system of the double-bus microgrid of claim 2, wherein the main controller is used for detecting the remaining power of each energy storage module in real time, and for entering the energy storage modules with the remaining power larger than a preset first power into a discharging sequence, and for entering the energy storage modules with the remaining power smaller than a preset second power into a charging sequence; the first and second electrical quantities are both constant, and the second electrical quantity is less than the first electrical quantity.
4. The dual bus microgrid complementary power supply system of claim 3, wherein the second amount of power is less than half of the first amount of power, and the first amount of power is greater than 90%.
5. The complementary power supply system of the double-bus microgrid as claimed in claim 1, wherein the main controller is further connected with each energy storage module respectively, and the main controller is used for controlling the energy storage modules to be disconnected with the energy storage charging bus when the residual electric quantity of the energy storage modules connected with the energy storage charging bus reaches a preset charging upper limit value, and reselecting the energy storage module with the minimum residual electric quantity to be connected with the energy storage charging bus;
the main controller is used for controlling the energy storage module to be disconnected with the energy storage discharging bus when the residual electric quantity of the energy storage module connected with the energy storage discharging bus reaches a preset discharging lower limit value, and reselecting the energy storage module with the maximum residual electric quantity to be connected into the energy storage discharging bus.
6. The double-bus microgrid complementary power supply system of claim 1, wherein a first static end of each grid-connected module is connected with an energy storage charging bus, and a second static end is connected with an energy storage discharging bus; each micro-grid, the first energy storage module and the second energy storage module are respectively connected with the public end of the corresponding grid-connected module; each grid-connected module has three states of disconnection, conduction of the public end and the first static end or conduction of the public end and the second static end.
7. The double-bus microgrid complementary power supply system of claim 1, wherein the energy storage module is a storage battery or a super capacitor.
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