CN114221324B - Multi-dimensional collaborative planning method for source network load storage of honeycomb type power distribution network - Google Patents
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Abstract
The invention discloses a source network load storage multidimensional collaborative planning method of a honeycomb power distribution network. In order to solve the problem that the power grid in the prior art is difficult to ensure the safety and stability of the operation of the power grid on the basis of utilizing new energy to generate power, the invention adopts a honeycomb power grid topological structure, designs a power grid planning mode of a main power supply and a standby power supply under three states, so that the voltage of the power grid is always kept stable, and the problem of voltage surge or sudden drop can not occur at will.
Description
Technical Field
The invention relates to the field of power distribution network planning methods, in particular to a source network load storage multidimensional collaborative planning method of a honeycomb power distribution network.
Background
In the prior art, the 'source-network-load-storage' interactive operation facing the power system refers to a plurality of interactive forms of source-source complementation, source-network coordination, network-load interaction, network-storage interaction, source-load interaction and the like among a power supply, a power grid, loads and energy storage, but the existing power system is not substantially free from the tradition of 'source follow-up', and on the basis of energy conservation and emission reduction, the safety and stability of the power grid operation are a great difficulty; in addition, the distributed energy is greatly increased, and after massive flexible resources are accessed into a power grid, coordination and control between the source network and the load storage are gradually complicated, so that the existing network has the problem that the safety and the stability of the power grid can be ensured on the basis of meeting the access of new energy.
For example, a "grid-connected micro-grid system based on an electric power-electric energy exchange sub-micro-grid" disclosed in chinese patent literature, its bulletin number CN106099985B, by designing a new energy micro-grid connected to a public grid as two sub-micro-grids capable of independently operating, respectively controlled switches connected to the public grid, and the electric power-electric energy exchange sub-micro-grid is controlled to selectively communicate with the grid-connected micro-grid or the public grid, so that the grid-connected micro-grid and the public grid independently operate and the electric power-electric energy exchange sub-micro-grid undertakes seamless exchange of electric power and electric power between the grid-connected micro-grid and the public grid, thereby realizing electric power complementary operation of the micro-grid and the public grid; because the new energy power generation has instability, the new energy power generation is completely used in the scheme, so that a single sub-network has a certain degree of defect in the digestion capability, and the sub-network can slow down the power generation pressure of the sub-network along with the grid-connected operation of the sub-network with the public network, but can bring operation burden to the public network.
Disclosure of Invention
The invention mainly solves the problems that the power grid in the prior art is difficult to ensure the safety and stability of the operation of the power grid on the basis of utilizing new energy to generate power; the source network load storage multidimensional collaborative planning method for the honeycomb-shaped power distribution network is provided.
The technical problems of the invention are mainly solved by the following technical proposal:
the invention comprises the following steps: establishing a honeycomb source network charge storage multidimensional synergetic basic model, constructing a topological structure connection relation of a power supply system, and setting the generation time of a specific unit; parameters such as a basic system architecture of the power distribution network, power information of a power generation unit, load characteristics of a load unit, energy storage unit coefficients and the like are obtained; calculating the energy storage power of the power grid, and building an overall planning scheme of an energy storage module, a power supply system and flexible equipment; obtaining the honeycomb source network load storage multidimensional collaborative planning method.
Preferably, the honeycomb source network charge storage multidimensional collaborative basic model comprises a plurality of diamond micro-network topological structures, and the micro-network topological structures are connected with each other to form a hexagonal regular honeycomb network topological structure; the micro-grid topology structure comprises a pair of main power supplies and a pair of standby power supplies, the main power supplies and the standby power supplies are connected to form a power system topology structure, an energy storage module is connected inside the power system topology structure, a plurality of main control base stations are respectively connected to four corners outside the power system topology structure, 3-6 micro-grids are connected and controlled by each main control base station, the hexagonal honeycomb topology structure can enable the whole power grid to operate more regularly and stably, and the stability of the power grid voltage is guaranteed through the arrangement of the main power supplies and the standby power supplies.
Preferably, the main power supply generates power by adopting clean energy, and the standby power supply generates power by adopting a conventional mode; in the topological structure of the power supply system, a first main power supply is arranged adjacent to a first standby power supply, the first standby power supply is arranged adjacent to a second main power supply, the second main power supply is arranged adjacent to the second standby power supply, the second standby power supply is arranged adjacent to the first main power supply, new energy is utilized to generate electricity to serve as the main power supply in a source-source complementary mode, the whole carbon emission of a power grid is reduced, a conventional power generation means is utilized to conduct subsequent power generation guarantee, the voltage in the power grid is stabilized, and the voltage stability of the power grid is maintained on the basis of energy conservation and emission reduction as much as possible.
Preferably, the master control base station is divided into a first class base station and a second class base station, and in the topology structure of the master control base station, the first class base station and the second class base station are both provided with an energy storage control end and a power supply control end for connecting and controlling a power supply system and an energy storage module.
Preferably, the main power supply and the standby power supply are respectively provided with an energy storage connecting end and a base station connecting end, and in the micro-grid topological structure, the energy storage connecting ends of the main power supply are connected with an energy storage module in a power supply system, and the base station connecting ends of the main power supply are connected with the power supply control ends of a class of base stations; the energy storage connecting end of the standby power supply is connected with the energy storage module in the power supply system, and the base station connecting end of the standby power supply is connected with the power supply control end of the second class base station.
Preferably, the power grid comprises three working states when in operation: normal operation state, energy storage calling state and standby operation state; under the normal running state, the main power supply in the power supply system generates power by means of clean energy, and simultaneously stores the residual electric energy into the energy storage module, so as to maintain stable power generation, intermittently starting the standby power supply to perform cooperative energy storage, and when the energy storage reaches a set highest threshold value, not starting the standby power supply in a short period, and reducing or stopping the energy storage of the main power supply; in an energy storage calling state, the main power supply cannot normally operate due to energy factors, at the moment, the energy storage module is started to discharge, and the standby power supply is intermittently started to perform compensation power generation; in the standby running state, the main power supply cannot be used and the electric energy in the energy storage module reaches the lowest threshold value, so that the standby power supply is started to charge and intermittently supply power to the energy storage module until the energy storage module is converted into an energy storage calling state; the relevant parameters of the energy storage module are set as follows: the energy storage power in the normal operation state, the energy storage calling state and the standby operation state is P respectively X 、P Y And P Z The main network is provided with N groups of micro-networks, and the most energy storage module is arrangedThe large threshold, the median and the minimum threshold are respectively P max 、P normal And P min The method comprises the steps of carrying out a first treatment on the surface of the The step builds a planning scheme of the energy storage module, the power supply system and the flexible equipment, and sets parameters required by calculation of energy storage power.
Preferably, when the power grid is in a normal running state, the energy storage power in the normal state can be obtained as follows,
wherein P is 1 Is the power of the main power supply,intermittent power generation for standby power supply, P USE For grid consumption, calculate P x Then, the real-time judgment is carried out, if the following inequality is satisfied
P normal ＜P X ＜P max
Continuously maintaining the intermittent power supply state of the main power supply power generation and standby power supply, and supplying P to the energy storage module x Power storage, if the following inequality is satisfied
P X ≥P max
Stopping intermittent power supply of the standby power supply; at this point the maximum threshold of the energy storage module is exceeded, thus stopping the power supply to the energy storage module and stopping the intermittent power supply of the backup power supply.
Preferably, when the power grid is in an energy storage calling state, the energy storage power in the energy storage calling state can be obtained according to the law of conservation of power as follows,
wherein P is f For the discharge power of the energy storage module, P is calculated Y Then, real-time judgment is carried out, if the following inequality is satisfied
P min ＜P Y ＜P normal
The energy storage module continues to discharge, and the standby power supply continues to be used for intermittent discharge, thereby satisfying the following inequality
P Y ≤P min
The energy storage module stops discharging to make P f Tending to 0 and entering a standby running state; at the moment, the power supply of the energy storage module is stopped when the power supply voltage is lower than the minimum threshold value of the energy storage module, and the power grid operation automatically enters a standby operation state.
Preferably, when the power grid is in the standby operation state, the energy storage power in the standby operation state is obtained as follows,
P Z ＝6N(P 2 -P USE )
calculation of P Z Then, the real-time judgment is carried out, if the following inequality is satisfied
P min ＜P Z ＜P max
The standby power supply is used for power supply and energy storage continuously, if the following inequality is satisfied
P Z ＞P max
Then the energy storage calling state is switched in; at the moment, the running state of the power grid gradually tends to be normal, and at the moment, if the main power supply is recovered, the normal running state can be entered, and if the main power supply is still recovered, the energy storage calling state is still adopted.
The beneficial effects of the invention are as follows:
1. the new energy is used as the main power generation energy, so that the energy conservation and emission reduction are realized to the maximum extent;
2. the scheme designs a planning mode of the main power supply and the standby power supply in three states, so that the voltage of the power grid is always kept stable, and the problem of voltage surge or sudden drop can not occur at will;
3. the honeycomb-shaped power grid topological structure is adopted in the scheme, so that the whole power grid has regularity and safety.
Drawings
FIG. 1 is a diagram of the topology of a micro network of the present invention;
FIG. 2 is a diagram of the topology of a cellular primary network of the present invention;
in the figure, a main power supply, a standby power supply, an energy storage module, a class-4 base station and a class-4 base station are shown as 1, 2.
Detailed Description
The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings.
Examples:
in the source network load storage multidimensional collaborative planning method of the honeycomb power distribution network, as shown in fig. 1 and 2, the source network load storage multidimensional collaborative planning method comprises a rhombic micro-grid topological structure, four corners of the topological structure are connected with a main control base station, and a plurality of rhombic micro-grid topological structures are connected through the main control base station to form a hexagonal regular honeycomb main network topological structure; the main control base station comprises a class-one base station and a class-two base station; the power supply system is divided into a main power supply 1 and a standby power supply 2, the main power supply and the standby power supply are alternately arranged along opposite angles of the diamond-shaped micro-grid topological structure, the main power supply and the standby power supply are respectively connected with an energy storage module, the main power supply is connected with a class-one base station, the standby power supply is connected with a class-two base station, and the class-one base station and the class-two base station in the main control base station respectively control the two power supplies to transmit power to a power grid or transmit power to the energy storage module.
The power grid comprises three states when in operation: the power supply system mainly depends on a main power supply to generate power and is matched with the standby power supply to intermittently supply power, so that voltage stability can be ensured after new energy is introduced to generate power, and the power supply system passes throughThe energy storage power of the energy storage module is calculated, so that the energy storage module can successfully store energy, and the time for stopping energy storage of the energy storage module can be better controlled through real-time comparison with the maximum energy storage threshold; when the main power supply cannot normally generate power due to the problem of new energy, the power grid enters an energy storage strip calling state, and in the running state, the power grid mainly depends on the discharging of the energy storage module and the intermittent power generation of the standby power supply to maintain the voltage balance in the power grid, according to ∈10>Calculating energy storage power, simultaneously comparing the energy storage power with the lowest energy storage threshold in real time, and stopping the discharge of the energy storage module once the lowest energy storage power reaches the lowest threshold, so that the power grid is in a standby operation state; in the standby running state, the standby energy is used for generating electricity through P Z ＝6N(P 2 -P USE ) And calculating the energy storage power of the power grid until the power grid is restored to an energy storage calling state.
It should be understood that the examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
Claims (3)
1. The source network load storage multidimensional collaborative planning method of the honeycomb power distribution network is characterized by comprising the following steps of:
1) Establishing a honeycomb source network charge storage multidimensional synergetic basic model, constructing a topological structure connection relation of a power supply system, and setting the generation time of a specific unit;
the honeycomb source network charge storage multidimensional synergetic basic model comprises a plurality of diamond micro-network topological structures, wherein the micro-network topological structures are connected with each other to form a hexagonal regular honeycomb network topological structure; the micro-grid topology structure comprises a pair of main power supplies and a pair of standby power supplies, wherein the main power supplies and the standby power supplies are connected to form a power system topology structure, an energy storage module is connected inside the power system topology structure, four corners outside the power system topology structure are respectively connected with a plurality of main control base stations, and each main control base station is connected with and controls 3-6 micro-grids;
the main power supply generates power by adopting clean energy, and the standby power supply generates power by adopting a conventional mode; in the topological structure of the power supply system, a first main power supply and a first standby power supply are adjacently arranged, the first standby power supply and a second main power supply are adjacently arranged, the second main power supply and the second standby power supply are adjacently arranged, and the second standby power supply and the first main power supply are adjacently arranged;
2) Parameters such as a basic system architecture of the power distribution network, power information of a power generation unit, load characteristics of a load unit, energy storage unit coefficients and the like are obtained; the power grid comprises three working states when in operation: normal operation state, energy storage calling state and standby operation state; under the normal running state, the main power supply in the power supply system generates power by means of clean energy, and simultaneously stores the residual electric energy into the energy storage module, so as to maintain stable power generation, intermittently starting the standby power supply to perform cooperative energy storage, and when the energy storage reaches a set highest threshold value, not starting the standby power supply in a short period, and reducing or stopping the energy storage of the main power supply; in an energy storage calling state, the main power supply cannot normally operate due to energy factors, at the moment, the energy storage module is started to discharge, and the standby power supply is intermittently started to perform compensation power generation; in the standby running state, the main power supply cannot be used and the electric energy in the energy storage module reaches the lowest threshold value, so that the standby power supply is started to charge and intermittently supply power to the energy storage module until the energy storage module is converted into an energy storage calling state; the relevant parameters of the energy storage module are set as follows: the energy storage power in the normal operation state, the energy storage calling state and the standby operation state is P respectively X 、P Y And P Z Setting N groups of micro-networks in the main network, and setting the maximum threshold, the median and the minimum threshold of the energy storage module as P respectively max 、P normal And P min ；
3) Calculating the energy storage power of the power grid, and building an overall planning scheme of an energy storage module, a power supply system and flexible equipment;
when the power grid is in a normal running state, the energy storage power in the normal state can be obtained as follows,wherein P is 1 Is the main power supply power>Intermittent power generation for standby power supply, P USE For grid consumption, calculate P x And then judging the data in real time, and if the following inequality is satisfied: p (P) normal <P X <P max Continuously maintaining the intermittent power supply state of the main power supply power generation and standby power supply, and supplying P to the energy storage module x Power storage, if the following inequality is satisfied: p (P) X ≥P max Stopping intermittent power supply of the standby power supply;
when the power grid is in an energy storage calling state, the energy storage power in the energy storage calling state can be obtained according to the law of conservation of power as follows:wherein P is f For the discharge power of the energy storage module, P is calculated Y And then, judging in real time, if the following inequality is satisfied: p (P) min <P Y <P normal The energy storage module continues to discharge, and the standby power supply continues to be used for intermittent discharge, so that the following inequality is satisfied: p (P) Y ≤P min The energy storage module stops discharging to make P f Tending to 0 and entering a standby running state;
when the power grid is in a standby running state, the energy storage power in the standby running state can be obtained as follows: p (P) Z ＝6N(P 2 -P USE ) Calculate P Z And then judging the data in real time, and if the following inequality is satisfied: p (P) min <P Z <P max And continuing to use the standby power supply for power supply and energy storage, and if the following inequality is satisfied: p (P) Z >P max Then the energy storage calling state is switched in;
4) Obtaining the honeycomb source network load storage multidimensional collaborative planning method.
2. The method for multidimensional collaborative planning of source network charge storage of a cellular power distribution network according to claim 1, wherein the master base station is divided into a class one base station and a class two base station, and in the topology of the master base station, the class one base station and the class two base station are provided with an energy storage control end and a power supply control end for connecting and controlling an energy storage module and a power supply system.
3. The method for multidimensional collaborative planning of source network charge storage of a cellular power distribution network according to claim 1, wherein the main power supply and the standby power supply are both provided with an energy storage connecting end and a base station connecting end, in a micro-grid topology structure, the energy storage connecting end of the main power supply is connected with an energy storage module in a power supply system, and the base station connecting end of the main power supply is connected with a power supply control end of a class of base stations; the energy storage connecting end of the standby power supply is connected with the energy storage module in the power supply system, and the base station connecting end of the standby power supply is connected with the power supply control end of the second class base station.
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