家庭纳网系统和社区级微电网系统Home network system and community-level microgrid system
本申请要求于2015年11月04日提交中国专利局、申请号为201510746334.8、发明名称为“家庭纳网系统和社区级微电网系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。This application claims priority to Chinese Patent Application No. 201510746334.8, entitled "Family Network System and Community Level Microgrid System" on November 4, 2015, the entire contents of which are incorporated by reference. In this application.
本发明涉及电力系统技术领域，更具体的说，涉及一种家庭纳网系统和社区级微电网系统。The present invention relates to the field of power system technologies, and more particularly to a home network system and a community level micro grid system.
微电网是指由分布式电源、储能装置、电力电子装置、负载及保护装置构成的能够实现自我控制、保护、管理的小型发配电系统。微电网可与大电网并网运行，能量不足时可从大电网吸收能量，能量充裕时可向大电网反馈能量。当大电网发生故障断电时，微电网可独立运行，对区域内的负载持续供电，从而提高供电可靠性。其中，电能以交流形式传输的是交流微电网，以直流形式传输的是直流微电网。Micro-grid refers to a small-scale power distribution system that can be self-controlled, protected and managed by distributed power sources, energy storage devices, power electronic devices, loads and protection devices. The microgrid can be operated in parallel with the large grid. When the energy is insufficient, energy can be absorbed from the large grid. When the energy is sufficient, the energy can be fed back to the large grid. When a large power grid fails, the microgrid can operate independently and continuously supply power to the load in the area, thereby improving power supply reliability. Among them, the electric energy transmitted in the form of AC is an AC microgrid, and the DC microgrid is transmitted in the form of DC.
现有典型的直流微电网的结构如图1所示，光伏01通过DC/DC(直流变流装置)001连接至直流母线，风能02通过AC/DC(交流-直流转换器)002连接至直流母线，储能装置03通过DC/DC003连接至直流母线，而后通过独立的AC/DC004实现与大电网04连接。这种直流微电网通过DC/AC(直流-交流转换器)005给交流负载05供电，或是通过DC/DC006给直流负载06供电，或直接给直流负载07供电。但是，对于某些无法直接利用直流微电网的直流负载的家用电器而言，需经过直流转交流再转直流的转换，即需要额外增加逆变装置。交流微电网目前应用比较普遍，当为家用电器供电时，对于光伏等新能源需经过多次变流才能满足供电需求。The structure of the existing typical DC microgrid is shown in Figure 1. Photovoltaic 01 is connected to the DC bus through DC/DC (DC converter) 001, and Wind Energy 02 is connected to DC through AC/DC (AC-DC converter) 002. The busbar, the energy storage device 03 is connected to the DC bus via DC/DC003, and then connected to the large grid 04 via a separate AC/DC004. The DC microgrid supplies power to the AC load 05 via a DC/AC (DC-AC converter) 005, or the DC load 06 via DC/DC 006, or directly to the DC load 07. However, for some household appliances that cannot directly utilize the DC load of the DC microgrid, the conversion from DC to AC and then to DC is required, that is, an additional inverter device is required. The current application of AC microgrid is relatively common. When powering household appliances, new energy sources such as photovoltaics need to undergo multiple changes to meet the power supply requirements.
综上可以看出，新能源在对家用电器供电时需经过多次变流转换，因此，电能损耗较大，能源利用效率不高。In summary, it can be seen that the new energy needs to undergo multiple converter conversions when powering the household appliances. Therefore, the power loss is large and the energy utilization efficiency is not high.
发明内容Summary of the invention
In view of this, the present invention provides a home network system and a community-level micro grid system to improve energy utilization when power is supplied to household appliances by using new energy sources.
一种家庭纳网系统，包括：A family network system, including:
新能源用电设备，所述新能源用电设备具有能够与家用电器连接，并能为所述家用电器供电的直流母线；a new energy power device having a DC bus that can be connected to a home appliance and can supply power to the home appliance;
与所述新能源用电设备连接的新能源发电系统；a new energy power generation system connected to the new energy power equipment;
通过所述双向DC/DC接入所述直流母线，并能够在所述双向DC/DC的控制下进行充放电的储能电池。An energy storage battery that can be charged and discharged under the control of the bidirectional DC/DC by the bidirectional DC/DC accessing the DC bus.
优选的，还包括：Preferably, the method further includes:
输入端与所述直流母线连接，输出端与所述家用电器连接，能够将母线电压转变成能够被所述家用电器直接利用的电压等级的DC/DC。The input terminal is connected to the DC bus, and the output terminal is connected to the home appliance, and the bus voltage can be converted into a DC/DC of a voltage level that can be directly utilized by the home appliance.
优选的，还包括：Preferably, the method further includes:
通过所述充电桩接入交流母线，并能够在所述充电桩的控制下进行充放电的汽车蓄电池。The vehicle battery is connected to the AC bus through the charging post, and can be charged and discharged under the control of the charging post.
优选的，所述新能源发电系统与所述直流母线连接。Preferably, the new energy power generation system is connected to the DC bus.
优选的，所述新能源用电设备为光伏空调。Preferably, the new energy electrical equipment is a photovoltaic air conditioner.
一种社区级微电网系统，包括：多个家庭纳网系统，各所述家庭纳网系统中新能源用电设备的直流母线侧互联，交流侧互联。A community-level microgrid system includes: a plurality of home network systems, wherein each of the household nano-network systems has a DC bus side interconnection and an AC side interconnection.
从上述的技术方案可以看出，本发明提供了一种家庭纳网系统和社区级微电网系统，社区级微电网系统包括多个家庭纳网系统，每个家庭纳网系统包括新能源用电设备、新能源发电系统、双向DC/DC和储能电池，新能源用电设备的直流母线与家用电器连接。新能源用电设备的直流母线可直接接入新能源发电系统的直流电能驱动，较传统而言，省去了电流的逆变过程。因此，家用电器采用新能源用电设备的直流母线供电与直接采用新能源发电系统供电相比，可以省去多次变流转换，从而提高了能源利用率。As can be seen from the above technical solution, the present invention provides a home network system and a community-level micro grid system. The community-level micro grid system includes a plurality of home network systems, and each family network system includes new energy power. Equipment, new energy generation systems, two-way DC/DC and energy storage batteries, DC busbars for new energy consumers are connected to household appliances. The DC bus of the new energy power equipment can be directly connected to the DC power of the new energy power generation system. Compared with the traditional, the current inversion process is omitted. Therefore, compared with the direct power supply of the new energy generation system, the home appliance adopts the DC bus power supply of the new energy power equipment, which can save multiple energy conversions, thereby improving energy utilization.
造性劳动的前提下，还可以根据提供的附图获得其他的附图。In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is an embodiment of the present invention, and it is not harmful to those skilled in the art.
On the premise of creative labor, other drawings can also be obtained from the drawings provided.
图1为现有技术实施例公开的一种直流微电网的结构示意图；1 is a schematic structural diagram of a DC microgrid disclosed in the prior art embodiment;
图2为本发明实施例公开的一种家庭纳网系统的结构示意图；2 is a schematic structural diagram of a home network system according to an embodiment of the present invention;
图3为本发明实施例公开的另一种家庭纳网系统的结构示意图；3 is a schematic structural diagram of another home network system according to an embodiment of the present invention;
图4为本发明实施例公开的一种社区级微电网系统的结构示意图。FIG. 4 is a schematic structural diagram of a community-level microgrid system according to an embodiment of the present invention.
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
本发明实施例公开了一种家庭纳网系统和社区级微电网系统，以实现采用新能源为家用电器供电时，提高能源利用率。The embodiment of the invention discloses a home network system and a community-level micro grid system, so as to improve energy utilization when using new energy to supply power to household appliances.
参见图2，本发明实施例公开了一种家庭纳网系统的结构示意图，包括：Referring to FIG. 2, an embodiment of the present invention discloses a structure of a home network system, including:
新能源用电设备11、新能源发电系统12、双向DC/DC(即双向直流变流装置)13和储能电池14；New energy consumer equipment 11, new energy power generation system 12, bidirectional DC/DC (ie bidirectional DC converter) 13 and energy storage battery 14;
新能源用电设备11具有能够与家用电器10连接，并能为家用电器10供电的直流母线。The new energy consumer 11 has a DC bus that can be connected to the home appliance 10 and can supply power to the home appliance 10.
新能源发电系统12与新能源用电设备11连接，用于为所述新能源用电设备11提供电能。The new energy power generation system 12 is connected to the new energy power equipment 11 for supplying electric energy to the new energy power equipment 11.
需要说明的是，新能源用电设备11的直流母线可直接接入新能源的直流电流驱动，较传统需要经过直流-交流-直流而言，可以省去逆变器。It should be noted that the DC bus of the new energy consumer equipment 11 can be directly connected to the DC current of the new energy source, and the inverter can be omitted compared with the conventional DC-AC-DC.
储能电池14通过双向DC/DC13就所述直流母线，并能够在双向DC/DC13的控制下进行充放电。The energy storage battery 14 is connected to the DC bus through the bidirectional DC/DC 13 and can be charged and discharged under the control of the bidirectional DC/DC 13.
其中，当新能源发电系统12产生的电能可以满足家用电器10用电需求且有盈余时，新能源发电系统12优先通过双向DC/DC13为储能电池14充电，充满后再通过DC/AC(直流-交流转换器)逆变接交流电网；当新能源发电系统12产生的电能无法满足家用电器10用电需求时，由储能电池14为家用电器10供电，当储能电池14的SOC(State of Charge，荷电状态)低于预设阈值时，为保护
储能电池14不受损，此时由交流电网为家用电器10供电。Wherein, when the electric energy generated by the new energy power generation system 12 can meet the electricity demand of the household appliance 10 and has a surplus, the new energy power generation system 12 preferentially charges the energy storage battery 14 through the bidirectional DC/DC 13 and then passes through the DC/AC after being fully charged ( The DC-AC converter is connected to the AC power grid; when the power generated by the new energy power generation system 12 cannot meet the power demand of the household appliance 10, the energy storage battery 14 supplies power to the home appliance 10, and when the energy storage battery 14 is SOC ( State of Charge, when the load state is below the preset threshold, for protection
The energy storage battery 14 is not damaged, and at this time, the home appliance 10 is powered by the AC power grid.
综上可以看出，新能源用电设备11的直流母线可直接接入新能源发电系统12的直流电能驱动，较传统而言，省去了电流的逆变过程。因此，家用电器10采用新能源用电设备11的直流母线供电与直接采用新能源发电系统12供电相比，可以省去多次变流转换，从而提高了能源利用率。In summary, it can be seen that the DC bus of the new energy power equipment 11 can be directly connected to the DC power of the new energy power generation system 12, which saves the current inversion process. Therefore, the home appliance 10 uses the DC bus power supply of the new energy power device 11 to save multiple energy conversions compared with the power supply directly using the new energy power generation system 12, thereby improving energy utilization.
目前市场上大多数家用电器内部均是直流电源供电，采用本申请中的直流母线直接给家用电器10供电，可以省去家用电器10内部的整流电路，从而在减少变流转换提高能源利用率的同时，就家用电器10本身而言，还可以节约整流电路成本。At present, most of the household appliances on the market are powered by a DC power supply. The DC bus in this application directly supplies power to the household appliance 10, which can eliminate the internal rectifier circuit of the household appliance 10, thereby reducing the converter conversion and improving the energy utilization rate. At the same time, as far as the household appliance 10 itself is concerned, the cost of the rectifier circuit can also be saved.
较优的，新能源用电设备11为光伏空调，新能源发电系统12为光伏发电系统。Preferably, the new energy power equipment 11 is a photovoltaic air conditioner, and the new energy power generation system 12 is a photovoltaic power generation system.
新能源发电系统12与新能源用电设备11通过直流母线连接。The new energy power generation system 12 is connected to the new energy consumer equipment 11 via a DC bus.
需要说明的是，当直流母线的电压等级适合家用电器10时，家用电器10直接与直流母线连接；当直流母线的电压等级不适合家用电器10时，家用电器10通过DC/DC与直流母线连接。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 through the DC/DC. .
因此，为进一步优化上述实施例，参见图3，本发明另一实施例公开的一种家庭纳网系统的结构示意图，在图1所示实施例的基础上，还包括：DC/DC15；Therefore, in order to further optimize the above embodiment, referring to FIG. 3, a schematic diagram of a structure of a home network system according to another embodiment of the present invention, further comprising: DC/DC15 on the basis of the embodiment shown in FIG.
DC/DC15的输入端与直流母线连接，输出端与家用电器10连接，DC/DC15能够将母线电压转变成能够被家用电器10直接利用的电压等级。The input of the DC/DC 15 is connected to the DC bus, and the output is connected to the home appliance 10, and the DC/DC 15 can convert the bus voltage into a voltage level that can be directly utilized by the home appliance 10.
为进一步优化上述实施例，还包括：充电桩16和汽车蓄电池17；To further optimize the above embodiment, further comprising: a charging post 16 and a car battery 17;
汽车蓄电池17通过充电桩16接入交流母线，并能够在充电桩16的控制下进行充放电。The vehicle battery 17 is connected to the AC bus through the charging post 16, and can be charged and discharged under the control of the charging post 16.
The charging pile 16 is similar in function to the fuel dispenser inside the gas station. It can be fixed on the ground or wall, installed in public buildings (public buildings, shopping malls, public parking lots, etc.) and residential parking lots or charging stations, depending on the voltage. The level is charged for various types of electric vehicles. The input end of the charging post 16 is directly connected to the AC power grid, and the output end is equipped with a charging plug for charging the electric vehicle.
因此，当储能电池14的SOC低于预设阈值时，汽车蓄电池17可作为储能电池14的补充，继续为家用电器10供电，从而可以进一步提高家庭纳网系统的供电可靠性。Therefore, when the SOC of the energy storage battery 14 is lower than a preset threshold, the automobile battery 17 can serve as a supplement to the energy storage battery 14, and continue to supply power to the home appliance 10, thereby further improving the power supply reliability of the home network system.
需要说明的是，补充蓄电池包括单不仅仅局限于汽车蓄电池17。It should be noted that the supplementary battery includes not only the automobile battery 17 but also the battery.
独立的家庭纳网系统一般都接有单一的储能电池14，由于储能电池14的容量较小，因此，无法满足家庭纳网系统长时间的独立运行。针对这一缺点，本发明还提供了一种社区级微电网系统。The independent home network system generally has a single energy storage battery 14. Since the capacity of the energy storage battery 14 is small, it cannot meet the long-term independent operation of the home network system. In response to this shortcoming, the present invention also provides a community-level microgrid system.
参见图4，本发明实施例公开的一种社区级微电网系统的结构示意图，包括：多个家庭纳网系统(图3中仅示出两个，分别为家庭纳网系统31和家庭纳网系统32)，各家庭纳网系统中新能源用电设备的直流母线侧互联，交流侧互联。Referring to FIG. 4, a schematic structural diagram of a community-level microgrid system disclosed in an embodiment of the present invention includes: multiple home network systems (only two are shown in FIG. 3, respectively, a home network system 31 and a home network) System 32), the DC bus side of the new energy power equipment in each family network system is interconnected, and the AC side is interconnected.
可以看出，本发明提供的社区级微电网系统通过将多个家庭纳网系统互联，形成一个分散式的储能结构，各储能电池14相互补充，增大社区级微电网系统的储能总能量，从而保证社区级微电网内重要负载可以长时间独立运行。It can be seen that the community-level microgrid system provided by the present invention forms a distributed energy storage structure by interconnecting multiple home network systems, and each energy storage battery 14 complements each other to increase the energy storage of the community-level microgrid system. The total energy ensures that important loads in the community-level microgrid can operate independently for long periods of time.
通过将多个家庭纳网系统中新能源用电设备的直流母线侧互联，交流侧互联，形成一个交直流双网络混合微电网系统，由于家用电器10中有少数电器例如旋转电机类负载为交流供电，因此，交流网络可以作为直流网络的补充，从而提高整个微电网系统供电的可靠性。By interconnecting the DC bus side of the new energy power equipment in multiple home network systems and interconnecting the AC side, an AC/DC dual network hybrid microgrid system is formed, because a small number of appliances such as a rotating electrical machine load in the household appliance 10 are used for communication. Power is supplied, so the AC network can be used as a supplement to the DC network, thereby increasing the reliability of the entire microgrid system.
需要说明的是，为提高微电网系统整体运行的经济性，大量分散的储能电池14优先为就近为家用电器供电。It should be noted that in order to improve the economics of the overall operation of the microgrid system, a large number of dispersed energy storage batteries 14 preferentially supply power to the nearby household appliances.
排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。Finally, it should also be noted that in this context, relational terms such as first and second are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities. There is any such actual relationship or order between operations. Furthermore, the term "comprises" or "comprises" or "comprises" or any other variations thereof is intended to encompass a non-exclusive inclusion, such that a process, method, article, or device that comprises a plurality of elements includes not only those elements but also Other elements, or elements that are inherent to such a process, method, item, or device. In the absence of more restrictions, the elements defined by the statement "including one..." are not
There are additional identical elements that are excluded from the process, method, article, or device that includes the described elements.
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。The various embodiments in the present specification are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the various embodiments may be referred to each other.
The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but the scope of the invention is to be accorded