CN117977588A - Energy distribution method, control device and energy distribution equipment of micro-grid - Google Patents
Energy distribution method, control device and energy distribution equipment of micro-grid Download PDFInfo
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Abstract
The invention provides an energy distribution method, a control device and energy distribution equipment of a micro-grid, wherein the energy distribution method comprises the following steps: acquiring an anti-backflow enabling mode of a micro-grid, and determining a power difference between a photovoltaic system and a load in the enabling mode; and determining a power supply mode and energy storage charging power of the load according to the enabling mode and the power difference. According to the invention, the anti-reflux enabling mode of the micro-grid is obtained, the power difference between the photovoltaic system and the load is determined in the anti-reflux enabling mode, and the power supply mode and the energy storage charging power of the load are finally determined, so that the photovoltaic power supply can be fully utilized, the charging power of the battery core can be limited, the electric energy can be fully utilized, and the adaptability of the micro-grid is improved.
Description
Technical Field
The present application relates to the field of energy technologies, and in particular, to an energy distribution method, a control device, and an energy distribution device for a micro-grid.
Background
With the prominence of global energy and environmental problems, renewable energy sources such as wind energy and solar energy have been greatly developed. The micro-grid is a small power generation and distribution system formed by integrating a distributed power supply, an energy storage device, an energy conversion device, related loads and a monitoring and protecting device. The power supply in the micro-grid is mostly a distributed power supply with smaller capacity, namely a small-sized unit with a power electronic interface, and the power supply comprises a micro gas turbine, a fuel cell, a photovoltaic cell, a small wind power generator set, an energy storage device such as a super capacitor, a flywheel and a storage battery. They are connected to the user side and have the features of low cost, low voltage, less pollution, etc. The micro-grid has flexible operation characteristics, can be operated in a grid connection or off-grid mode, and can meet the electric energy and heat energy requirements of local users. The micro-grid improves the power supply reliability of the distributed power generation system, realizes the integrated operation of the distributed power supply and the load, reduces the pollution emission of the system, and becomes an important component in the construction of the smart power grid.
In the prior art, the micro-grid cannot fully utilize the photovoltaic in the practical application process, and when the battery is charged, the charging power is unstable, the electric energy cannot be fully utilized, the damage to the battery core is large, the safety risk of the battery core is high, and the adaptability of the micro-grid is poor.
Disclosure of Invention
The invention mainly aims to provide an energy distribution method of a micro-grid, and aims to solve the technical problem that electric energy cannot be fully utilized in photovoltaic power generation and battery power supply of the micro-grid.
To achieve the above object, the present invention provides an energy distribution method of a micro grid, the energy distribution method comprising the steps of:
acquiring an anti-reflux enabling mode of a micro-grid;
determining a power difference between the photovoltaic system and the load according to the anti-reflux enabling mode;
Determining a power supply mode and energy storage charging power of a load according to the anti-backflow enabling mode and the power difference;
the step of determining the power supply mode and the stored energy charging power of the load according to the anti-backflow enabling mode and the power difference comprises the following steps:
When the power difference is greater than or equal to zero, controlling a power grid to supply power to a load and an energy storage at the same time, and limiting the energy storage charging power to be MIN { P9, MIN [200, P6] -P3, P8};
The step of determining the power supply mode and the stored energy charging power of the load according to the enabling mode and the power difference comprises the following steps:
when the power difference is smaller than zero, obtaining energy storage charging power and acceptable power of an energy storage system;
Determining a first power supply mode and a first energy storage charging power according to the anti-backflow enabling mode and the energy storage charging power;
Determining a second power supply mode and second energy storage charging power according to the anti-backflow enabling mode and acceptable power of the energy storage system;
the step of obtaining the anti-backflow enabling mode of the micro-grid comprises the following steps:
determining whether the micro-grid anti-countercurrent enabling or the micro-grid anti-countercurrent disabling is performed according to the selection operation of a user on the intelligent terminal;
the step of determining the first power supply mode and the first energy storage charging power according to the anti-backflow enabling mode and the energy storage charging power comprises the following steps:
When the power difference is larger than or equal to the energy storage charging power, determining that a first power supply mode is that a load is independently powered by the photovoltaic, and the rest photovoltaic and a power grid jointly supply power for energy storage;
when the micro-grid anti-backflow is not enabled, determining that the first stored charging power is MIN { P9, MIN [200, P6] +P3, P8};
when the micro-grid is enabled to prevent reverse flow, determining a second difference value between the power difference and BMS request charging power;
If the second difference value is greater than or equal to zero, determining that the first energy storage charging power is BMS request charging power, and if the second difference value is less than zero, determining that the first energy storage charging power is MIN { P9, MIN [200, P6] +P3, P8};
Wherein, P3 is the power difference, P6 is the maximum allowable power of the commercial power, P8 is the BMS request charging power, and P9 is the constant value of the energy storage charging power.
In an embodiment, the step of determining the power difference between the photovoltaic system and the load according to the anti-reverse current enabling mode comprises:
acquiring real-time active power of a load and real-time active power of photovoltaic according to an anti-backflow enabling mode of the micro-grid;
and determining the power difference according to the real-time active power of the load and the real-time active power of the photovoltaic.
In an embodiment, the step of determining the second power supply mode and the second stored charge power according to the anti-backflow enabling mode and the acceptable power of the energy storage system includes:
When the power difference is greater than or equal to the acceptable power of the energy storage system, determining that a second power supply mode is photovoltaic for simultaneously supplying power to a load and energy storage;
when the micro-grid anti-backflow is not enabled, determining that the second stored charging power is min { P3, P8};
When the micro-grid is enabled to prevent reverse flow, determining a third difference value between the power difference and BMS request charging power;
And if the third difference value is greater than or equal to zero, determining that the second energy storage charging power is the BMS request charging power, and if the third difference value is less than zero, determining that the second energy storage charging power is the power difference.
In an embodiment, the step of determining the second power supply mode and the second stored charge power according to the anti-backflow enabling mode and the acceptable power of the energy storage system includes:
When the power difference is smaller than acceptable power of the energy storage system, determining that a second power supply mode is photovoltaic for supplying power to a load and energy storage at the same time;
when the micro-grid anti-backflow is not enabled, determining that the second stored charging power is min {100, P8};
When the micro-grid is enabled to prevent countercurrent, determining the second stored charging power to be min {100, P8}, and limiting the photovoltaic output power to be 100+P4 or P8+P4;
Wherein P4 is the real-time active power of the load.
In an embodiment, after the step of determining the power supply mode and the stored charging power of the load according to the enabling mode and the power difference, the method further includes:
When the anti-backflow disabling mode is adopted and the charging is completed, controlling the redundant electric quantity to be output to a power grid;
And when the photovoltaic power is in the anti-backflow enabling mode and the charging is completed, limiting the photovoltaic power to be smaller than or equal to the real-time active power of the load.
In addition, to achieve the above object, the present invention also provides a control device including: the system comprises a memory, a processor and a micro-grid energy distribution program stored on the memory and capable of running on the processor, wherein the micro-grid energy distribution program is configured to realize the micro-grid energy distribution method.
In addition, to achieve the above object, the present invention also provides an energy distribution device including the control apparatus as described above.
According to the embodiment of the invention, the anti-reflux enabling mode of the micro-grid is obtained, the power difference between the photovoltaic system and the load is determined in the anti-reflux enabling mode, and the power supply mode and the energy storage charging power of the load are finally determined, so that the power supply of the photovoltaic can be fully utilized, the charging power of the battery core can be limited, the electric energy is fully utilized, and the adaptability of the micro-grid is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow diagram of a method for energy distribution in a micro grid according to an embodiment of the present invention;
Fig. 2 is a schematic flow chart of an energy distribution method of a micro grid according to another embodiment of the present invention;
Fig. 3 is a schematic flow chart of an energy distribution method of a micro grid according to another embodiment of the present invention;
fig. 4 is a schematic flow chart of an energy distribution method of a micro grid according to another embodiment of the present invention;
fig. 5 is a schematic flow chart of an energy distribution method of a micro grid according to another embodiment of the present invention;
fig. 6 is a schematic flow chart of an energy distribution method of a micro grid according to another embodiment of the present invention;
fig. 7 is a schematic flow chart of an energy distribution method of a micro grid according to another embodiment of the present invention;
Fig. 8 is a schematic flow chart of an energy distribution method of a micro grid according to another embodiment of the present invention;
fig. 9 is a schematic structural diagram of a micro grid.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention, and that well-known modules, units and their connections, links, communications or operations with each other are not shown or described in detail. Also, the described features, architectures, or functions may be combined in any manner in one or more implementations. It will be appreciated by those skilled in the art that the various embodiments described below are for illustration only and are not intended to limit the scope of the invention. It will be further appreciated that the modules or units or processes of the embodiments described herein and illustrated in the drawings may be combined and designed in a wide variety of different configurations. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The definitions of the various terms or methods set forth in the following embodiments are generally based on the broad concepts that may be practiced with the disclosure in the examples except where logically no such definitions are set forth, and in the following understanding, each specific lower specific definition of a term or method is to be considered an inventive subject matter and should not be interpreted as a narrow sense or as a matter of prejudice to the contrary that the specification does not disclose such a specific definition. Similarly, the order of the steps in the method is flexible and variable on the premise that the steps can be logically implemented, and specific lower limits in various nouns or generalized concepts of the method are within the scope of the invention.
In order to solve the problems existing in the prior art, the invention provides an energy distribution method of a micro-grid, wherein the energy distribution method of the micro-grid is applied to energy distribution equipment; it will be appreciated that the energy distribution device is provided with a control device for storing and executing the method described below, and the control device may be implemented by a main controller, for example, an MCU (Micro controller Unit, micro-control unit), a DSP (DIGITAL SIGNAL Process, digital signal processing Chip), an FPGA (Field Programmable GATE ARRAY, programmable gate array Chip), an SOC (System On Chip), or the like.
Referring to fig. 1 and 9, in an embodiment of the invention, the energy distribution method includes steps S100-S300, wherein:
S100, acquiring an anti-backflow enabling mode of a micro-grid;
s200, determining the power difference between the photovoltaic system and the load according to the anti-backflow enabling mode;
s300, determining a power supply mode and energy storage charging power of the load according to the anti-backflow enabling mode and the power difference.
In this embodiment, according to the difference of the load and the output condition of the power of the micro-grid, a corresponding anti-backflow enabling mode is determined, specifically, the anti-backflow enabling mode includes two types of anti-backflow enabling and anti-backflow disabling, according to the difference of the anti-backflow enabling modes, the power difference between the photovoltaic system and the load is further determined, according to the difference of the anti-backflow enabling modes, the load power supply mode and the energy storage charging power are determined, and the micro-grid is optimally managed. It can be understood that in the two different anti-backflow modes, namely the anti-backflow enabling mode and the anti-backflow disabling mode, the determined power difference, the power supply mode of the load and the stored energy charging power are different. In addition, in this embodiment, it is first required to determine whether the micro grid needs to prevent reverse flow or not, and when reverse flow is required, the micro grid is in a reverse flow prevention enabling mode; when no anti-reflux is needed, an anti-reflux disabling mode is employed. It can be understood that the anti-backflow enabling mode can be determined through a terminal by a user, or can be determined by the control device according to the actual outputtable power data of the photovoltaic system, and is preferably determined manually by the user. In particular, the anti-backflow enabling means that when the power generated by the photovoltaic system exceeds the power required by the load in the micro-grid, the excessive electric energy may flow back to the grid without proper control, which may cause instability of the grid or create other potential problems. Therefore, the anti-reverse function is particularly important in micro-grids.
The anti-backflow enabling state refers to that when the power generated by the photovoltaic system exceeds the load demand, the anti-backflow enabling mode is adopted to store and consume redundant electric energy or a mode of limiting the generated power of the photovoltaic panel is adopted to prevent the electric energy from flowing back to the power grid. In this state, the system will intelligently adjust the load supply mode and the stored charge power based on the power difference between the photovoltaic system and the load. In particular, when the power generated by the photovoltaic system is greater than the load demand, the system will preferentially meet the power demand of the load and store excess electrical energy into the energy storage device. The charging power of the energy storage device can be dynamically adjusted according to the power difference between the photovoltaic system and the load, so that the stable operation of the system is ensured.
When the power generated by the photovoltaic system is insufficient to meet the load demand, the system is switched to an energy storage power supply mode, and electric energy is released from the energy storage equipment to meet the load demand. Meanwhile, the control device can monitor the power output condition of the photovoltaic system in real time, and once the power generated by the photovoltaic system exceeds the load demand, the photovoltaic power supply mode is switched to again, and redundant electric energy is stored in the energy storage equipment. Through such an optimized management, the micro-grid can more efficiently utilize the electric energy generated by the photovoltaic system, and at the same time, the stable operation of the grid is ensured. In addition, through reasonable scheduling of the charging and discharging of the energy storage equipment, the service life of the energy storage equipment can be further prolonged, and the running cost of the system is reduced.
In the anti-backflow enabling state, when the output power of the photovoltaic system is larger than the load demand, the micro-grid control system can automatically adjust the output of the photovoltaic system to be matched with the load demand, and the photovoltaic system is prevented from transmitting power to a grid. In the state of incapacitation of preventing countercurrent, the photovoltaic system can output power according to actual conditions, but care needs to be taken to prevent the power grid voltage from being too high or too low so as to ensure the stability of the power grid.
Compared with the prior art, the method and the device have the advantages that the anti-backflow enabling mode is determined, the situation that feeding to a power grid cannot occur under the condition that the power of a photovoltaic system is too high, so that the operation of a micro power grid is more stable and reliable, when the photovoltaic output is smaller, the micro power grid cannot be fed basically, the influence is small, at the moment, surplus electricity can be enabled to be connected to the network under the condition that the energy storage system is charged, and the surplus electricity is left, so that the anti-backflow disabling mode is adopted; when the photovoltaic power is larger, if any power is fed to the network, the fluctuation of the power grid is larger, so that the stability of the power grid and the stability of related loads are affected, the power of photovoltaic power generation needs to be limited at the moment, and an anti-backflow enabling mode needs to be adopted, so that the power feeding of the photovoltaic system to the power grid is prevented.
In addition, through the determination of the anti-backflow enabling mode, the power difference is determined on the basis, and the power supply mode and the energy storage charging power of the load are accurately set by combining the anti-backflow enabling mode and the power difference, so that the electric energy generated by the photovoltaic system is fully utilized. Meanwhile, when the energy storage charging power is determined, the charging characteristics of the battery cells can be fully considered in different anti-backflow enabling modes, so that the safety and stability of the battery cells are ensured, and potential damage is avoided.
In addition, intelligent management of the energy storage device is needed to ensure efficient operation. In the energy storage charging process, according to the charging state and the charging rate of the energy storage equipment, the control device can adjust the charging strategy in real time, and overcharge or overdischarge is avoided, so that the service life of the energy storage equipment is prolonged. Meanwhile, according to parameters such as frequency, voltage and the like of the power grid, the control device can optimize the charging and discharging processes of the energy storage equipment so as to improve the operation efficiency of the micro power grid and ensure the efficient and stable operation of the micro power grid.
In this embodiment, referring to fig. 9, the combination of the photovoltaic solar panel and the photovoltaic controller provides an energy source for the bus, at this time, the power input has only one working condition, the lithium battery and the battery control system form an energy storage system, which can supply power to the ac power grid, or take power from the ac power grid, that is, charge the energy storage system, the power grid can supply power to the load through the bus, or can be used as the feed of the energy storage of the micro-grid, but the feed network of the energy storage is countercurrent to the power grid, which may have an influence on other loads measured by the network, so that the anti-countercurrent arrangement is provided, that is, the energy storage system or the photovoltaic is not allowed to feed the electric quantity. The photovoltaic power generation system and the energy storage system are mutually matched, so that the voltage stability of the bus is ensured, and the load requirement is met. The lithium battery and the battery control system can monitor and adjust the output power in real time in the energy storage and power supply process, so that the stability of power supply is ensured, the conversion efficiency of the photovoltaic power generation system is improved, the cost is further reduced, and the reliability is improved.
According to the embodiment, the anti-countercurrent enabling mode of the micro-grid is obtained, the power difference between the photovoltaic system and the load is determined in the anti-countercurrent enabling mode, and the power supply mode and the energy storage charging power of the load are finally determined, so that the power supply of the photovoltaic can be fully utilized, the charging power of the battery core can be limited, the electric energy is fully utilized, and the adaptability of the micro-grid is improved.
Further, referring to fig. 2, another embodiment of the present invention provides a method for distributing energy of a micro grid, based on the embodiment shown in fig. 1, the step of determining a power difference between a photovoltaic system and a load according to the anti-backflow enabling mode includes S210-S220, where:
s210, acquiring real-time active power of a load and real-time active power of photovoltaic according to an anti-backflow enabling mode of the micro-grid;
S220, determining the power difference according to the real-time active power of the load and the real-time active power of the photovoltaic.
In this embodiment, after determining the anti-backflow enabling mode of the micro grid, the real-time active power of the load and the real-time active power of the photovoltaic of the whole micro grid are obtained, and the absolute value of the real-time active power of the load and the absolute value of the real-time active power of the photovoltaic are subjected to difference, that is, if the difference is positive, the photovoltaic output is smaller than the load, if the difference is negative, the photovoltaic output is larger than the load, wherein the real-time active power of the load is only positive, electricity is used, and the real-time active power of the photovoltaic is only positive, and electricity generation is shown.
In this embodiment, according to the obtained power difference, the power supply mode may be further combined with the enabling mode, and the power supply mode and the stored energy charging power may be determined, where the power supply mode specifically includes: the power grid supplies power to the load and simultaneously charges energy storage, the load is only supplied with power by the photovoltaic, the rest of the photovoltaic charges the energy storage, full power is charged under the condition that the battery allows, the load is only supplied with power by the photovoltaic, the rest of the photovoltaic charges the energy storage, the rest of the power grid supplements the power grid and the like, when the power difference is positive, namely the photovoltaic power generation is smaller than the power consumption of the load, the photovoltaic power is supplied to the load, and if the power supply capacity of the photovoltaic is insufficient, the power is supplied to the power grid. In addition, according to the charging state of the energy storage device and the set charging upper limit, the charging power of the energy storage device is adjusted in real time. When the charging state of the energy storage device is close to the full state, the charging power of the energy storage device is reduced, and the device is prevented from being damaged by overcharge. When the charging state of the energy storage equipment is lower, the charging power of the energy storage equipment is improved, so that the charging efficiency of the energy storage equipment is improved, the power supply mode is flexibly adjusted according to the actual power demand, and the running efficiency and stability of the micro-grid are improved.
Further, referring to fig. 3, a further embodiment of the present invention provides an energy distribution method of a micro-grid, based on the embodiment shown in fig. 1, the step of determining a power supply mode and an energy storage charging power of a load according to the enabling mode and the power difference includes S310, where:
and S310, when the power difference is greater than or equal to zero, controlling the power grid to supply power to the load and the energy storage simultaneously, and limiting the energy storage charging power to be MIN { P9, MIN [200, P6] -P3, P8}.
In this embodiment, P3 is a power difference, P6 is a maximum allowable power of the commercial power, P8 is a BMS request charging power, and P9 is an energy storage charging power fixed value.
In this embodiment, when the power difference is greater than or equal to zero, the power grid is controlled to supply power to the load and the energy storage device at the same time, and in order to avoid overcharging of the energy storage system, the charging power of the energy storage device needs to be limited, and specific values are MIN { P9, MIN [200, P6] -P3, P8}. In order to ensure stable operation of the power supply system, a power difference between real-time active power of the load and real-time active power of the photovoltaic needs to be monitored in real time. When P3 is greater than or equal to zero, this means that the power supply capability of the photovoltaic is not able to meet the load requirements, at which point the grid is required to provide power to power the load and the energy storage device.
Specifically, limiting the charging power can also avoid the influence of the charging speed of the energy storage device on the power supply quality of the load, and the charging speed of the energy storage device can be effectively controlled by reasonably setting the values of P6, P8 and P9 so as to meet the requirements in different scenes, thereby having better flexibility and adaptability. Wherein the BMS requests the charging power to be a positive value, and the same is true in other embodiments.
Further, referring to fig. 4, still another embodiment of the present invention provides a method for distributing energy of a micro-grid, based on the embodiment shown in fig. 1, the step of determining a power supply mode and an energy storage and charging power of a load according to the enabling mode and the power difference includes S320-S340, where:
s320, when the power difference is smaller than zero, acquiring energy storage charging power and acceptable power of an energy storage system;
s330, determining a first power supply mode and first energy storage charging power according to the anti-backflow enabling mode and the energy storage charging power;
S340, determining a second power supply mode and second energy storage charging power according to the anti-backflow enabling mode and the acceptable power of the energy storage system.
In this embodiment, the acceptable power of the energy storage system is preferably 100, but in other embodiments, the acceptable power is not particularly limited, and in practical applications, the energy storage system needs to select a suitable energy storage and charging power according to different enabling modes and operating conditions, so as to achieve an optimal energy storage effect.
In this embodiment, the energy storage system needs to select a suitable power supply mode and energy storage charging power according to different enabling modes and energy storage charging power. For example, when the power difference is less than zero, the energy storage system should take the stored charge power and the energy storage system acceptable power.
Specifically, when the power difference is smaller than zero, the energy storage charging power and the acceptable power of the energy storage system are firstly obtained, the first power supply mode and the first energy storage charging power are firstly determined according to the anti-backflow enabling mode and the energy storage charging power, specifically, the first power supply mode and the first energy storage charging power are adopted only when the power difference is required to be larger than the energy storage charging power, if the power difference is smaller than the energy storage charging power, the second power supply mode and the second energy storage charging power are determined according to the anti-backflow enabling mode and the acceptable power of the energy storage system, specifically, the first power supply mode is that the load is powered by only photovoltaic, the rest photovoltaic is energy storage charging, the rest of the power grid is supplemented, and the limiting charging power is MIN { P9, MIN [200, P6] +P3, P8}; specifically, when P3 is smaller than 0, that is, the photovoltaic is still capable of charging the battery after supplying power to the load, and when P3 is larger than P9, that is, the photovoltaic is insufficient to satisfy the power of P9 after supplying power to the load, the rest is supplemented by the power grid, and the charging power is MIN { P9, MIN [200, P6] +p3, P8}, that is, the minimum value of the stored energy charging power, the maximum power allowed by the power grid or the minimum value of the power difference added by 200, and the minimum value of the BMS request charging power, the stable operation and the efficient charging of the energy storage system are realized by determining the proper power supply mode and the stored energy charging power. In practical application, the method can be adjusted and optimized according to practical conditions so as to meet different requirements.
In this embodiment, P3 is a power difference, P6 is a maximum allowable power of the commercial power, P8 is a BMS request charging power, and P9 is an energy storage charging power fixed value.
Further, referring to fig. 5, a further embodiment of the present invention provides a method for distributing energy of a micro-grid, based on the embodiment shown in fig. 4, the step of obtaining an anti-backflow enabling mode of the micro-grid includes S130, where:
s130, determining whether the micro-grid is enabled or disabled in anti-reflux according to the selection operation of a user on the intelligent terminal;
The step of determining the first power supply mode and the first energy storage charging power according to the anti-backflow enabling mode and the energy storage charging power includes S331-S334, wherein:
S331, when the power difference is larger than or equal to the energy storage charging power, determining that a first power supply mode is that a load is independently powered by the photovoltaic, and the rest of the photovoltaic and a power grid jointly supply power for the energy storage;
s332, when the micro-grid anti-backflow is not enabled, determining that the first energy storage charging power is MIN { P9, MIN [200, P6] +P3, P8};
S333, when the micro-grid is enabled to prevent reverse flow, determining a second difference value between the power difference and BMS request charging power;
S334, if the second difference value is greater than or equal to zero, determining that the first stored energy charging power is BMS request charging power, and if the second difference value is less than zero, determining that the first stored energy charging power is MIN { P9, MIN [200, P6] +P3, P8}.
In this embodiment, in the first power supply mode, since the power difference is greater than the energy storage charging power, it is determined that the load is independently powered by the photovoltaic, and the remaining photovoltaic and the power grid are jointly powered by the energy storage, and when the micro-grid is enabled to prevent reverse current, the BMS request charging power is obtained, a second difference value between the power difference and the BMS request charging power is calculated, and the first energy storage charging power is determined according to the positive and negative conditions of the second difference value. And carrying out energy storage charging operation according to the determined first energy storage charging power. In the charging process, the running state of the micro-grid and the charging conditions of the photovoltaic power generation system and the energy storage system are monitored in real time, so that the efficient running of the micro-grid is realized. The power generation capacity of the photovoltaic power generation system is fully utilized while the load demand is met, the dependence on a power grid is reduced, and the energy utilization rate is improved. In addition, through real-time monitoring micro-grid operation state, adjust energy storage charging power, guaranteed energy storage system's safe and reliable operation.
In this embodiment, P3 is a power difference, P6 is a maximum allowable power of the commercial power, P8 is a BMS request charging power, and P9 is an energy storage charging power fixed value.
Further, referring to fig. 6, another embodiment of the present invention provides a method for distributing energy to a micro grid, based on the embodiment shown in fig. 5, the step of determining the second power supply mode and the second stored-energy charging power according to the anti-backflow enabling mode and the acceptable power of the energy storage system includes S341-S344, where:
S341, determining that a second power supply mode is a photovoltaic mode for simultaneously supplying power to a load and energy storage when the power difference is larger than or equal to acceptable power of the energy storage system;
S342, when the micro-grid anti-backflow is not enabled, determining that the second stored energy charging power is min { P3, P8};
S343, when the micro-grid is enabled to prevent reverse flow, determining a third difference value between the power difference and BMS request charging power;
And S344, if the third difference value is greater than or equal to zero, determining that the second energy storage charging power is the BMS request charging power, and if the third difference value is less than zero, determining that the second energy storage charging power is the power difference.
In this embodiment, the second power supply mode refers to that the photovoltaic power generation system provides power for the load and the energy storage system at the same time after a certain condition is met. The mode can ensure stable power supply, simultaneously maximally utilize the potential of photovoltaic power generation and improve the energy utilization efficiency.
In this embodiment, when the anti-backflow function of the micro-grid is not working, the charging power of the second energy storage system is determined to be min { P3, P8}, so that the charging rate of the energy storage system can be effectively ensured not to exceed the output rate of the photovoltaic power generation system. When the anti-reverse flow function of the micro grid is enabled, we need to calculate a third difference between the power difference and the charging power requested by the BMS (battery management system). And determining the charging power of the second energy storage system by judging the magnitude of the third difference value. If the third difference is greater than or equal to zero, it is indicated that the requested charging power of the BMS may be satisfied, and at this time, the charging power of the second energy storage system is equal to the requested charging power of the BMS. If the third difference is less than zero, it is indicated that the charging power of the energy storage system needs to be adjusted according to the power difference to ensure that the battery is not overcharged. The charging strategy can effectively manage the power flow in the micro-grid, ensure the stability of power supply and simultaneously maximally utilize the photovoltaic power generation resources. In the implementation process, the charging parameters can be adjusted according to actual conditions so as to meet different power requirements and energy storage targets, specifically, P3 is a power difference, and P8 is a BMS request for charging power.
Further, referring to fig. 7, a further embodiment of the present invention provides a method for distributing energy to a micro-grid, based on the embodiment shown in fig. 4, the step of determining the second power supply mode and the second stored-energy charging power according to the anti-backflow enabling mode and the acceptable power of the energy storage system includes S345-S347, where:
s345, when the power difference is smaller than acceptable power of the energy storage system, determining that a second power supply mode is photovoltaic for simultaneously supplying power to a load and energy storage;
S346, when the micro-grid anti-backflow is not enabled, determining that the second stored charge power is min {100, P8};
and S347, when the micro-grid is enabled to prevent reverse flow, determining that the second energy storage charging power is min {100, P8}, and limiting the photovoltaic output power to be 100+P4 or P8+P4.
In this embodiment, the photovoltaic power generation system supplies the generated electrical energy to both the load and the energy storage system. In the process, the output power of the photovoltaic power generation system is adjusted by monitoring the power demand of the micro-grid and the charging state of the energy storage system in real time. When the state of charge of the energy storage system is close to full load, the photovoltaic power generation system limits the output power of the energy storage system so as to avoid overcharging of the energy storage system. When the micro-grid backflow prevention is not enabled, the second energy storage charging power determining method is as follows: first, it is determined that the BMS requests the charging power, i.e., P8. Then, the charging power of the energy storage system is set to min {100, P8}. Here min represents a minimum value to ensure that the energy storage system is not overcharged. When the micro-grid is enabled to prevent reverse flow, the determination method of the second energy storage charging power is consistent with the method, and the charging power of the energy storage system is set to be min {100, P8}. Meanwhile, in order to protect the energy storage system, the photovoltaic output power needs to be limited to 100+p4 or p8+p4.
In the embodiment, the method realizes the cooperative work of the photovoltaic power generation and the energy storage system of the micro-grid, so that the power demand of a load can be met, the photovoltaic power generation resource can be effectively utilized, and the dependence on the traditional energy source is reduced. In addition, through the real-time adjustment of the output power of the photovoltaic power generation system, the safe and stable operation of the energy storage system can be ensured, and the service life of the energy storage system is prolonged. In the actual operation process, the output power of the photovoltaic power generation system and the charging power of the energy storage system can be adjusted according to the actual situation. For example, when the load demand is large, the output power of the photovoltaic power generation system may be appropriately increased to meet the power demand of the load. On the contrary, when the load demand is smaller, the output power of the photovoltaic power generation system can be reduced, the waste of energy sources is avoided, the energy cost is reduced, and the power supply reliability is improved.
In this embodiment, P4 is the real-time active power of the load, and P8 is the BMS request charging power.
Further, referring to fig. 8, still another embodiment of the present invention provides an energy distribution method for a micro-grid, based on the embodiment shown in fig. 1, after the step of determining the power supply mode and the stored charge power of the load according to the enabling mode and the power difference, the method further includes S400-S500, where:
s400, controlling the output of the redundant electric quantity to the power grid when the power grid is in the anti-backflow disabling mode and the charging is completed;
S500, limiting the photovoltaic power to be smaller than or equal to the real-time active power of the load when the photovoltaic power is in the anti-backflow enabling mode and the charging is completed.
In the present embodiment, the anti-reverse flow disabled mode and the anti-reverse flow enabled mode are two charging control strategies. Under the anti-backflow disabling mode, the surplus electric quantity after the charging is completed can be output to the power grid, so that electric energy waste is avoided. And in the anti-backflow enabling mode, the photovoltaic power is limited after the charging is completed, so that the photovoltaic power is smaller than or equal to the real-time active power of the load, and the stable operation of the power grid is ensured. For the anti-backflow disabling mode, when the surplus electric quantity after the charging is completed is output to the power grid, the electric power balance of the power grid can be effectively regulated. Particularly in a photovoltaic power generation system, the output of the redundant electric quantity can make up for the defect due to the strong intermittence and instability of the photovoltaic power generation, and the operation efficiency of the photovoltaic power generation system is improved. And in the anti-backflow enabling mode, the photovoltaic power is limited to be smaller than or equal to the real-time active power of the load, so that overload of a power grid caused by excessive photovoltaic power generation can be avoided. The mode is suitable for occasions with high requirements on electric power stability, such as domestic electricity, important facility electricity and the like. By limiting the photovoltaic power generation power, the safe operation of the power grid can be ensured, and the fault risk is reduced.
In the embodiment, the anti-backflow disabling mode and the anti-backflow enabling mode can be flexibly selected according to actual requirements and power grid conditions. In the charging process, the two modes are switched by monitoring real-time data of the photovoltaic power generation system and the load, so that an optimal charging control strategy is realized. In summary, the anti-backflow disabled mode and the anti-backflow enabled mode provide an effective solution for the excess power output and photovoltaic power limitation after charging is complete, respectively.
The invention also proposes a control device comprising: the system comprises a memory, a processor and a micro-grid energy distribution program stored on the memory and capable of running on the processor, wherein the micro-grid energy distribution program is configured to realize the micro-grid energy distribution method.
It should be noted that, because the control device of the present invention is based on the above-mentioned energy distribution method of the micro-grid, the embodiments of the control device of the present invention include all the technical solutions of all the embodiments of the energy distribution method of the micro-grid, and the achieved technical effects are identical, and are not repeated herein.
The invention also proposes an energy distribution device comprising a control device as described in the above embodiments.
It should be noted that, because the energy distribution device of the present invention is based on the control device, the embodiments of the energy distribution device of the present invention include all the technical solutions of all the embodiments of the control device, and the achieved technical effects are identical, and are not repeated herein.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of embodiments, it will be clear to a person skilled in the art that the above embodiment method may be implemented by means of software plus a necessary general hardware platform, but may of course also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (7)
1. An energy distribution method of a micro grid, characterized in that the energy distribution method comprises the following steps:
acquiring an anti-reflux enabling mode of a micro-grid;
determining a power difference between the photovoltaic system and the load according to the anti-reflux enabling mode;
Determining a power supply mode and energy storage charging power of a load according to the anti-backflow enabling mode and the power difference;
the step of determining the power supply mode and the stored energy charging power of the load according to the anti-backflow enabling mode and the power difference comprises the following steps:
When the power difference is greater than or equal to zero, controlling a power grid to supply power to a load and an energy storage at the same time, and limiting the energy storage charging power to be MIN { P9, MIN [200, P6] -P3, P8};
The step of determining the power supply mode and the stored energy charging power of the load according to the enabling mode and the power difference comprises the following steps:
when the power difference is smaller than zero, obtaining energy storage charging power and acceptable power of an energy storage system;
Determining a first power supply mode and a first energy storage charging power according to the anti-backflow enabling mode and the energy storage charging power;
Determining a second power supply mode and second energy storage charging power according to the anti-backflow enabling mode and acceptable power of the energy storage system;
the step of obtaining the anti-backflow enabling mode of the micro-grid comprises the following steps:
determining whether the micro-grid anti-countercurrent enabling or the micro-grid anti-countercurrent disabling is performed according to the selection operation of a user on the intelligent terminal;
the step of determining the first power supply mode and the first energy storage charging power according to the anti-backflow enabling mode and the energy storage charging power comprises the following steps:
When the power difference is larger than or equal to the energy storage charging power, determining that a first power supply mode is that a load is independently powered by the photovoltaic, and the rest photovoltaic and a power grid jointly supply power for energy storage;
when the micro-grid anti-backflow is not enabled, determining that the first stored charging power is MIN { P9, MIN [200, P6] +P3, P8};
when the micro-grid is enabled to prevent reverse flow, determining a second difference value between the power difference and BMS request charging power;
If the second difference value is greater than or equal to zero, determining that the first energy storage charging power is BMS request charging power, and if the second difference value is less than zero, determining that the first energy storage charging power is MIN { P9, MIN [200, P6] +P3, P8};
Wherein, P3 is the power difference, P6 is the maximum allowable power of the commercial power, P8 is the BMS request charging power, and P9 is the constant value of the energy storage charging power.
2. The method of energy distribution of a micro grid according to claim 1, wherein the step of determining the power difference between the photovoltaic system and the load according to the anti-reverse current enabling mode comprises:
acquiring real-time active power of a load and real-time active power of photovoltaic according to an anti-backflow enabling mode of the micro-grid;
and determining the power difference according to the real-time active power of the load and the real-time active power of the photovoltaic.
3. The method of claim 1, wherein the step of determining the second power supply mode and the second stored charge power according to the anti-reflux enabling mode and the energy storage system acceptable power comprises:
When the power difference is greater than or equal to the acceptable power of the energy storage system, determining that a second power supply mode is photovoltaic for simultaneously supplying power to a load and energy storage;
when the micro-grid anti-backflow is not enabled, determining that the second stored charging power is min { P3, P8};
When the micro-grid is enabled to prevent reverse flow, determining a third difference value between the power difference and BMS request charging power;
And if the third difference value is greater than or equal to zero, determining that the second energy storage charging power is the BMS request charging power, and if the third difference value is less than zero, determining that the second energy storage charging power is the power difference.
4. The method of claim 1, wherein the step of determining the second power supply mode and the second stored charge power according to the anti-reflux enabling mode and the energy storage system acceptable power comprises:
When the power difference is smaller than acceptable power of the energy storage system, determining that a second power supply mode is photovoltaic for supplying power to a load and energy storage at the same time;
when the micro-grid anti-backflow is not enabled, determining that the second stored charging power is min {100, P8};
When the micro-grid is enabled to prevent countercurrent, determining the second stored charging power to be min {100, P8}, and limiting the photovoltaic output power to be 100+P4 or P8+P4;
Wherein P4 is the real-time active power of the load.
5. The method of claim 1, wherein after the step of determining the power supply mode and the stored charging power of the load according to the enabling mode and the power difference, further comprising:
When the anti-backflow disabling mode is adopted and the charging is completed, controlling the redundant electric quantity to be output to a power grid;
And when the photovoltaic power is in the anti-backflow enabling mode and the charging is completed, limiting the photovoltaic power to be smaller than or equal to the real-time active power of the load.
6. A control device, characterized in that the control device comprises: a memory, a processor and an energy distribution program of a micro grid stored on the memory and executable on the processor, the energy distribution program of the micro grid configured to implement the energy distribution method of the micro grid according to any one of claims 1 to 5.
7. An energy distribution device comprising a control device according to claim 6.
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