Disclosure of Invention
In view of this, the invention provides a home network receiving system and a community-level microgrid system, so as to improve the energy utilization rate when new energy is adopted to supply power to household appliances.
A home networking system comprising:
the system comprises new energy electric equipment and a control system, wherein the new energy electric equipment is provided with a direct current bus which can be connected with a household appliance and can supply power to the household appliance;
the new energy power generation system is connected with the new energy power utilization equipment;
bidirectional DC/DC;
the energy storage battery is connected to the direct current bus through the bidirectional DC/DC and can be charged and discharged under the control of the bidirectional DC/DC.
Preferably, the method further comprises the following steps:
the input end is connected with the direct current bus, the output end is connected with the household appliance, and the bus voltage can be converted into DC/DC of voltage grade which can be directly utilized by the household appliance.
Preferably, the method further comprises the following steps:
charging piles;
through fill electric pile access alternating current bus, and can be in fill the car battery that carries out charge-discharge under electric pile's control.
Preferably, the new energy power generation system is connected with the direct current bus.
Preferably, the new energy electric equipment is a photovoltaic air conditioner.
A community-level microgrid system comprising: the system comprises a plurality of household network receiving systems, wherein direct current bus sides of new energy electric equipment in each household network receiving system are interconnected, and alternating current sides of the new energy electric equipment are interconnected.
According to the technical scheme, the invention provides a family net accommodating system and a community-level micro-grid system, wherein the community-level micro-grid system comprises a plurality of family net accommodating systems, each family net accommodating system comprises new energy electric equipment, a new energy power generation system, a bidirectional DC/DC and an energy storage battery, and a direct current bus of the new energy electric equipment is connected with household appliances. The direct current bus of the new energy electric equipment can be directly connected to the direct current electric energy drive of the new energy power generation system, and compared with the traditional method, the inversion process of current is omitted. Therefore, compared with the direct current bus power supply of the new energy electric equipment, the direct current bus power supply of the household appliance can save multiple times of conversion, thereby improving the energy utilization rate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a household nano-grid system and a community-level micro-grid system, which are used for improving the energy utilization rate when new energy is adopted to supply power to household appliances.
Referring to fig. 2, an embodiment of the present invention discloses a structural schematic diagram of a home network access system, including:
the system comprises new energy electric equipment 11, a new energy power generation system 12, a bidirectional DC/DC (namely a bidirectional direct current converter) 13 and an energy storage battery 14;
wherein,
the new energy electric device 11 has a dc bus that can be connected to the household appliance 10 and can supply power to the household appliance 10.
The new energy power generation system 12 is connected with the new energy electric equipment 11 and is used for providing electric energy for the new energy electric equipment 11.
It should be noted that the dc bus of the new energy electrical device 11 can be directly connected to the dc current drive of the new energy, and compared with the conventional dc-ac-dc bus, an inverter can be omitted.
The energy storage battery 14 is charged and discharged through the bidirectional DC/DC13 to the DC bus under the control of the bidirectional DC/DC 13.
When the electric energy generated by the new energy power generation system 12 can meet the power consumption requirement of the household appliance 10 and is surplus, the new energy power generation system 12 preferentially charges the energy storage battery 14 through the bidirectional DC/DC13, and is connected with an alternating current power grid through DC/AC (direct current-alternating current converter) inversion after being fully charged; when the electric energy generated by the new energy power generation system 12 cannot meet the power consumption requirement of the household appliance 10, the energy storage battery 14 supplies power to the household appliance 10, and when the SOC (state of charge) of the energy storage battery 14 is lower than a preset threshold, the energy storage battery 14 is protected from being damaged, and at this time, the alternating current power grid supplies power to the household appliance 10.
In summary, the dc bus of the new energy electrical device 11 can be directly connected to the dc power drive of the new energy power generation system 12, and compared with the conventional method, the current inversion process is omitted. Therefore, compared with the direct current bus power supply of the new energy electric equipment 11, the household appliance 10 directly adopts the new energy power generation system 12 to supply power, and can save multiple times of conversion, thereby improving the energy utilization rate.
At present, most of household appliances in the market are supplied with power by a direct-current power supply, the direct-current bus in the application is adopted to directly supply power to the household appliances 10, and a rectifying circuit inside the household appliances 10 can be omitted, so that the energy utilization rate is improved by reducing the conversion, and meanwhile, the rectifying circuit cost can be saved for the household appliances 10.
Preferably, the new energy electric equipment 11 is a photovoltaic air conditioner, and the new energy power generation system 12 is a photovoltaic power generation system.
The new energy power generation system 12 is connected to the new energy electric equipment 11 through a dc bus.
It should be noted that, when the voltage level of the dc bus is suitable for the household appliance 10, the household appliance 10 is directly connected to the dc bus; when the voltage level of the DC bus is not suitable for the household appliance 10, the household appliance 10 is connected to the DC bus by DC/DC.
Therefore, in order to further optimize the above embodiment, referring to fig. 3, a schematic structural diagram of a home network hosting system disclosed by another embodiment of the present invention further includes, on the basis of the embodiment shown in fig. 1: DC/DC 15;
DC/DC15 has an input connected to a DC bus and an output connected to the appliance 10, and DC/DC15 is capable of converting the bus voltage to a voltage level that can be directly utilized by the appliance 10.
In order to further optimize the above embodiment, the method further includes: a charging pile 16 and an automobile storage battery 17;
the automobile storage battery 17 is connected to the alternating current bus through the charging pile 16, and can be charged and discharged under the control of the charging pile 16.
Wherein,
the charging pile 16 is similar to a fuel charger in a gas station, can be fixed on the ground or on the wall, is installed in public buildings (public buildings, shopping malls, public parking lots, etc.) and residential district parking lots or charging stations, and can charge various types of electric vehicles according to different voltage levels. The input end of the charging pile 16 is directly connected with an alternating current network, and the output end of the charging pile is provided with a charging plug for charging the electric automobile.
Therefore, when the SOC of the energy storage battery 14 is lower than the preset threshold, the automobile storage battery 17 can be used as a supplement for the energy storage battery 14 to continue to supply power to the household appliance 10, so that the power supply reliability of the household network receiving system can be further improved.
It should be noted that the supplementary battery includes, but is not limited to, the vehicle battery 17.
The independent household network receiving system is generally connected with a single energy storage battery 14, and the capacity of the energy storage battery 14 is small, so that the long-time independent operation of the household network receiving system cannot be met. Aiming at the defect, the invention also provides a community-level micro-grid system.
Referring to fig. 4, a schematic structural diagram of a community-level microgrid system disclosed in an embodiment of the present invention includes: a plurality of home network systems (only two are shown in fig. 3, namely, a home network system 31 and a home network system 32), in which the dc bus sides and the ac sides of the new energy electric devices in the respective home network systems are interconnected.
Therefore, the community-level microgrid system provided by the invention has the advantages that a distributed energy storage structure is formed by interconnecting a plurality of household nanowire systems, the energy storage batteries 14 supplement each other, and the total energy storage energy of the community-level microgrid system is increased, so that the important loads in the community-level microgrid system can be ensured to operate independently for a long time.
The direct current bus sides and the alternating current sides of new energy electric equipment in a plurality of household network receiving systems are interconnected to form an alternating current-direct current double-network hybrid micro-grid system, and as a few electric appliances such as rotating electrical machines and other loads in the household electric appliance 10 supply power for alternating current, the alternating current network can be used as a supplement of the direct current network, so that the power supply reliability of the whole micro-grid system is improved.
It should be noted that, in order to improve the economy of the overall operation of the microgrid system, the large number of distributed energy storage batteries 14 preferentially supply power to the household appliances nearby.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.