CN103001254B - Alternating current-direct current hybrid micro-grid system - Google Patents
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
本发明提供了一种交直流混合微网系统，包括：光储一体供电单元、三联供供电单元和具备连锁功能的高可靠性供电单元，其中，光储一体供电单元和三联供供电单元形成高可靠性供电单元的双电源，同时，光储一体供电单元和三联供供电单元彼此起备自投作用，为连接在母线上的负载提供电能。本发明提出的交直流混合微网结构在保证现有供电结构的基础上进行升级，结构得到进一步强化，考虑了供电区域内不同类型负荷需求及不同等级电负荷需求，可以提高系统内所有负荷的供电可靠性，同时实现微网内重要负荷的不间断高可靠性供电。
The present invention provides an AC/DC hybrid micro-grid system, including: an optical-storage integrated power supply unit, a triple power supply unit, and a high-reliability power supply unit with interlocking functions, wherein the optical-storage integrated power supply unit and the triple power supply unit form a high The dual power supply of the reliable power supply unit, at the same time, the optical storage integrated power supply unit and the triple power supply unit function as backup and self-injection to each other to provide power for the load connected to the bus. The AC/DC hybrid micro-grid structure proposed by the present invention is upgraded on the basis of ensuring the existing power supply structure, and the structure is further strengthened, taking into account the demands of different types of loads and different levels of electric loads in the power supply area, which can improve the power consumption of all loads in the system Power supply reliability, while realizing uninterrupted high-reliability power supply of important loads in the microgrid.
Description
技术领域 technical field
本发明涉及微型供电系统领域，尤其涉及一种交直流混合微网系统。 The invention relates to the field of micro power supply systems, in particular to an AC-DC hybrid micro-grid system.
背景技术 Background technique
微网是指由分布式发电装置、储能装置、能量转换装置和负荷组成的微型供电系统，微网系统构建逐渐成为满足负荷增长需求、减少环境污染、提高能源综合利用效率和供电可靠性的一种有效途径。微网既可以与大型电网相连以并网模式运行，也可以以孤岛模式运行，通常境况下两种模式可以相互转换，以保证系统供电的可靠性。在微网中，常常采用太阳能、风能、储能等分布式能源发电作为电源，通过一条汇流母线进行分配电能。该结构以结构简单，操作操作方便为优势，广泛的存在于微电网结构中。随着微电网技术的发展，系统供电可靠性要求也在不断的提高，现阶段的微网结构能在一定程度上解决此类问题，但对于更高可靠性要求的设备却无法得到保证。 Micro-grid refers to a micro-power supply system composed of distributed power generation devices, energy storage devices, energy conversion devices and loads. The construction of micro-grid systems has gradually become an important solution to meet the needs of load growth, reduce environmental pollution, improve comprehensive energy utilization efficiency and power supply reliability. an effective way. The microgrid can be connected to the large power grid to operate in grid-connected mode or in island mode. Usually, the two modes can be converted to each other to ensure the reliability of system power supply. In the microgrid, distributed energy generation such as solar energy, wind energy, and energy storage is often used as the power source, and the electric energy is distributed through a busbar. The structure has the advantages of simple structure and convenient operation, and is widely used in microgrid structures. With the development of microgrid technology, the reliability requirements of system power supply are also constantly improving. The current microgrid structure can solve such problems to a certain extent, but it cannot be guaranteed for equipment with higher reliability requirements.
公开号为CN102684215A的专利申请“风光储微网系统并网运行的能量管理系统”提出了一种微网系统，该系统包括微网内部系统及一条10kV交流母线和一些常规负荷，微网内部还包含一条380V交流母线、一套风力发电系统、一套光伏发电系统、一套电池储能系统及适量的就地负荷。上述微网系统中，系统内部的各类设备均作了一定的整合，集中连接到微网系统交流母线上，系统内部就地负荷中无等级划分，在电能供应不足时，系统中各负荷被切断的可能性是相同的。此外，如果微网系统发生故障，系统内部负荷均无法保证供应，重要负荷也将会失去电能支撑。 The patent application with the publication number CN102684215A "Energy management system for grid-connected operation of wind-solar-storage micro-grid system" proposes a micro-grid system, which includes the internal system of the micro-grid and a 10kV AC busbar and some conventional loads. It includes a 380V AC busbar, a wind power generation system, a photovoltaic power generation system, a battery energy storage system and an appropriate amount of local load. In the above-mentioned micro-grid system, all kinds of equipment in the system have been integrated to a certain extent, and are centrally connected to the AC bus of the micro-grid system. There is no classification of local loads in the system. When the power supply is insufficient, each load in the system is The possibility of cutting off is the same. In addition, if the microgrid system fails, the internal loads of the system cannot guarantee supply, and important loads will also lose power support.
由此可见，目前，微网的结构配置主要为单层结构，微网系统内各负荷供电可靠性均一致，无法实现负荷分级供电。 It can be seen that at present, the structural configuration of the microgrid is mainly a single-layer structure, and the reliability of the power supply of each load in the microgrid system is consistent, and it is impossible to realize load grading power supply.
发明内容 Contents of the invention
本发明所要解决的技术问题在于，提供一种提高系统内所有负荷的供电可靠性，以及实现重要负荷的不间断高可靠性供电的交直流混合微网系统。 The technical problem to be solved by the present invention is to provide an AC/DC hybrid micro-grid system that improves the power supply reliability of all loads in the system and realizes uninterrupted high-reliability power supply of important loads.
本发明提供一种交直流混合微网系统，包括：光储一体供电单元、三联供供电单元和具备连锁功能的高可靠性供电单元，其中，所述光储一体供电单元和三联供供电单元形成所述高可靠性供电单元的双电源。 The present invention provides an AC/DC hybrid micro-grid system, including: an optical-storage integrated power supply unit, a triple power supply unit, and a high-reliability power supply unit with a chain function, wherein the optical-storage integrated power supply unit and the triple power supply unit form a The dual power supply of the high reliability power supply unit.
所述光储一体供电单元进一步包括直流供电系统、AC/DC变换装置、第一交流负荷和交流微网母线，所述直流供电系统通过所述AC/DC变换装置接入所述交流微网母线，所述第一交流负荷连接在所述交流微网母线上，由所述直流供电系统供电。 The optical-storage integrated power supply unit further includes a DC power supply system, an AC/DC conversion device, a first AC load, and an AC micro-grid bus, and the DC power supply system is connected to the AC micro-grid bus through the AC/DC conversion device , the first AC load is connected to the AC microgrid bus and powered by the DC power supply system.
所述直流供电系统进一步包括光伏装置、储能装置、直流负荷和直流母线，所述光伏装置和储能装置通过DC/DC变换装置接入所述直流母线，所述直流负荷与所述直流母线连接，由所述光伏装置和储能装置供电。 The DC power supply system further includes a photovoltaic device, an energy storage device, a DC load and a DC bus, the photovoltaic device and the energy storage device are connected to the DC bus through a DC/DC conversion device, and the DC load is connected to the DC bus connected, powered by the photovoltaic device and energy storage device.
所述三联供供电单元进一步包括三联供发电机组、第二交流负荷和三联供交流母线，所述三联供发电机组通过所述三联供交流母线与所述第二交流负荷相连，向所述第二交流负荷供电。 The triple power supply unit further includes a triple power supply generator set, a second AC load and a triple power supply AC busbar, the triple power supply generator set is connected to the second AC load through the triple power supply AC busbar, and supplies power to the second AC power supply unit. AC load power supply.
所述三联供交流母线通过第一并网开关连接到第一母线，所述交流微网母线通过第二并网开关连接到第二母线，所述第一母线和所述第二母线通过母联开关相连，所述第一母线作为所述第二母线的备自投设备，所述第二母线作为所述第一母线的备自投设备。 The triple supply AC busbar is connected to the first busbar through the first grid-connected switch, the AC micro-grid busbar is connected to the second busbar through the second grid-connected switch, and the first busbar and the second busbar are connected through the busbar The switches are connected, the first bus is used as the backup automatic switching equipment of the second bus, and the second bus is used as the backup automatic switching equipment of the first bus.
所述高可靠性供电单元进一步包括高可靠性供电母线和重要负载，所述重要负载连接在所述高可靠性供电母线上，所述高可靠性供电母线通过互锁式开关分别连接到所述第一母线和所述第二母线，当所述互锁式开关接通所述第一母线时，所述高可靠性供电母线与所述第二母线断开连接；当所述互锁式开关接通所述第二母线时，所述高可靠性供电母线与所述第一母线断开连接；正常工作时，所述高可靠性供电母线与所述第一母线和所述第二母线之一相连接，当检测到母线失压时，互锁式开关切断与失压母线的连接而接通到未失压的母线上，保证与所述高可靠性供电母线连接的所述重要负载的正常供电。 The high-reliability power supply unit further includes a high-reliability power supply bus and an important load, the important load is connected to the high-reliability power supply bus, and the high-reliability power supply bus is respectively connected to the The first busbar and the second busbar, when the interlocking switch connects the first busbar, the high-reliability power supply busbar is disconnected from the second busbar; when the interlocking switch When the second bus is connected, the high-reliability power supply bus is disconnected from the first bus; One-phase connection, when the voltage loss of the bus is detected, the interlock switch will cut off the connection with the voltage loss bus and connect to the bus without voltage loss, so as to ensure the safety of the important load connected to the high reliability power supply bus normal power supply.
所述第一母线和所述第二母线上连接有其他负载。 Other loads are connected to the first bus and the second bus.
所述其他负载包括蓄冰空调设备。 The other loads include ice storage air conditioning equipment.
本发明实施例提供的交直流混合微网系统，在保证现有供电结构的基础上进行升级，结构得到进一步强化，考虑了供电区域内不同类型负荷需求及不同等级电负荷需求，可以提高系统内所有负荷的供电可靠性，同时能实现微网内重要负荷的不间断高可靠性供电。 The AC/DC hybrid micro-grid system provided by the embodiment of the present invention is upgraded on the basis of ensuring the existing power supply structure, and the structure is further strengthened, taking into account different types of load requirements and different levels of electrical load requirements in the power supply area, which can improve the system capacity. The power supply reliability of all loads can realize uninterrupted and high-reliability power supply of important loads in the microgrid.
附图说明 Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。 In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.
图1是本发明提供的一种交直流混合微网系统的一个实施例的结构框图； Fig. 1 is a structural block diagram of an embodiment of an AC/DC hybrid microgrid system provided by the present invention;
图2是本发明提供的一种交直流混合微网系统一个实施例的结构图； Fig. 2 is a structural diagram of an embodiment of an AC/DC hybrid microgrid system provided by the present invention;
图3是本发明提供的一种交直流混合微网系统一个实施例的重要负荷供电设计结构图。 Fig. 3 is a structural diagram of an important load power supply design of an embodiment of an AC/DC hybrid microgrid system provided by the present invention.
具体实施方式 Detailed ways
下面参考附图对本发明的优选实施例进行描述。 Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
实施例一 Embodiment one
图1是本发明提供的一种交直流混合微网系统的一个实施例的结构框图。如图1所示，本实施例构造了一种交直流混合微网系统，包括以下结构： Fig. 1 is a structural block diagram of an embodiment of an AC/DC hybrid microgrid system provided by the present invention. As shown in Figure 1, this embodiment constructs an AC-DC hybrid microgrid system, including the following structure:
D101、光储一体供电单元。光储一体供电单元包括直流供电系统、AC/DC变换装置、第一交流负荷和交流微网母线。直流供电系统通过AC/DC变换装置接入交流微网母线，第一交流负荷连接在交流微网母线上，由直流供电系统供电。直流供电系统包括光伏装置、储能装置、直流负荷和直流母线，光伏装置和储能装置通过DC/DC变换装置接入直流母线，直流负荷与直流母线连接，由光伏装置和储能装置供电。 D101, optical storage integrated power supply unit. The optical-storage integrated power supply unit includes a DC power supply system, an AC/DC conversion device, a first AC load and an AC micro-grid bus. The DC power supply system is connected to the AC microgrid busbar through the AC/DC conversion device, and the first AC load is connected to the AC microgrid busbar, and is powered by the DC power supply system. The DC power supply system includes a photovoltaic device, an energy storage device, a DC load and a DC bus. The photovoltaic device and the energy storage device are connected to the DC bus through a DC/DC conversion device. The DC load is connected to the DC bus and powered by the photovoltaic device and the energy storage device.
D102、三联供供电单元。三联供供电单元包括三联供发电机组、第二交流负荷和三联供交流母线，三联供发电机组通过三联供交流母线与第二交流负荷相连，向第二交流负荷供电。 D102, triple power supply unit. The triple power supply unit includes a triple power supply generator set, a second AC load and a triple power supply AC busbar. The triple power supply generator set is connected to the second AC load through the triple power supply AC busbar to supply power to the second AC load.
D103、高可靠性供电单元。高可靠性供电单元包括高可靠性供电母线和重要负载，与光储一体供电单元和三联供供电单元相连接，光储一体供电单元和三联供供电单元形成高可靠性供电单元的双电源。 D103, high reliability power supply unit. The high-reliability power supply unit includes a high-reliability power supply bus and important loads, and is connected to the optical-storage integrated power supply unit and the triple power supply unit. The optical-storage integrated power supply unit and the triple power supply unit form the dual power supply of the high-reliability power supply unit.
通过以上结构，组成了交直流混合微网系统。 Through the above structure, the AC and DC hybrid microgrid system is formed.
实施例二 Embodiment two
图2是本发明提供的一种交直流混合微网系统一个实施例的结构图。本实施例详细构造了本发明提供的交直流混合微网系统。 Fig. 2 is a structural diagram of an embodiment of an AC/DC hybrid microgrid system provided by the present invention. In this embodiment, the AC/DC hybrid microgrid system provided by the present invention is constructed in detail.
以400V母线为基础，将各发电单元及用电单元通过一定的组合方式形成如图2所示的交直流混合微网系统。其中，C区域为整个微网系统的结构，包含A区域三联供供电单元和B区域光储一体供电单元，负荷5为三级负荷由母线4供电；负荷1、负荷2为二级负荷由母线6和母线7供电；负荷3、负荷4为一级负荷，负荷3为直流负荷，由直流母线供电，负荷4由母线8供电；蓄冰空调为微网外其他负荷。微网区域A、B、C、D均可以单独工作。 Based on the 400V bus, each power generation unit and power consumption unit are combined in a certain way to form an AC-DC hybrid micro-grid system as shown in Figure 2. Among them, area C is the structure of the entire microgrid system, including the triple power supply unit in area A and the integrated optical storage power supply unit in area B. Load 5 is a tertiary load powered by bus 4; load 1 and load 2 are secondary loads powered by bus 6 and bus 7 supply power; load 3 and load 4 are primary loads, load 3 is a DC load powered by the DC bus, and load 4 is powered by bus 8; ice storage air conditioners are other loads outside the microgrid. Microgrid areas A, B, C, and D can all work independently.
本系统可以拆分成不同的供电模块，整个系统C结构由光储一体供电单元B、三联供供电单元A构成，其中模块B在变流器故障时，通过开断相应的开关，可以形成直流供电系统D模块，各模块有各自运行的基本情况。 The system can be split into different power supply modules. The structure of the whole system C is composed of the optical storage integrated power supply unit B and the triple power supply unit A. When the converter fails, the module B can form a DC power supply by turning off the corresponding switch. The D module of the power supply system, each module has its own basic situation of operation.
模块B为光储一体供电单元，由光伏装置PV、储能装置Bat和直流负荷3组成，可独立运行。其中光伏装置PV、储能装置Bat通过DC/DC变换装置接入直流母线，直流系统通过DC/AC变换装置并入交流微网母线7。储能装置Bat、光伏装置PV既可以为直流负荷供电，也可以为交流负荷供电。光储一体供电单元通过并网开关PCC2与母线5相连。 Module B is an integrated photovoltaic-storage power supply unit, which is composed of photovoltaic device PV, energy storage device Bat and DC load 3, and can operate independently. The photovoltaic device PV and the energy storage device Bat are connected to the DC bus through the DC/DC conversion device, and the DC system is integrated into the AC microgrid bus 7 through the DC/AC conversion device. The energy storage device Bat and the photovoltaic device PV can supply power for both DC loads and AC loads. The optical-storage integrated power supply unit is connected to the bus 5 through the grid-connected switch PCC2.
模块A为三联供供电单元，三联供发电机组及交流负荷1通过开关接至母线6上，母线6通过并网开关PCC1连接至母线4上。孤网运行时，并网开关PCC1断开，由三联供发电机组向负荷供电；并网运行时，并网开关PCC1导通，电能通过母线4和母线6进行交换。 Module A is a triple power supply unit. The triple power generator set and AC load 1 are connected to the bus 6 through a switch, and the bus 6 is connected to the bus 4 through the grid-connected switch PCC1. When running in isolated grid, the grid-connected switch PCC1 is disconnected, and the triple power supply generator sets supply power to the load;
本系统采用双电源进线形式。母线4和母线5之间通过母联开关6相连，起到备自投作用。正常运行时，开关6断开。当市电一发生故障时，备自投开关自动闭合，母线4上的负荷由线路2转供，当故障恢复后，开关6不允许自动恢复，需要手动恢复原来状态；当市电二发生故障时，备自投开关自动闭合，母线5上负荷由线路1转供，当故障恢复后，开关6不允许自动恢复，需要手动恢复原来状态。 The system adopts the form of dual power supply incoming lines. The bus bar 4 and the bus bar 5 are connected through a bus tie switch 6 to play the role of standby automatic switching. During normal operation, switch 6 is disconnected. When mains 1 fails, the backup self-transfer switch is automatically closed, and the load on bus 4 is transferred from line 2. When the fault is restored, switch 6 is not allowed to recover automatically and needs to be manually restored to its original state; when mains 2 fails , the standby self-transfer switch is automatically closed, and the load on bus 5 is transferred from line 1. When the fault is recovered, switch 6 is not allowed to automatically recover, and needs to be manually restored to the original state.
正常模式分析 normal mode analysis
正常运行时，开关5、7、8、10、11、12-18以及并网开关PCC1、PCC2、闭合，开关6、9断开。系统并网运行，等效于全部分布式电源和交流负荷接入一条微网母线。此时，三联供发电机组和储能装置Bat都运行在恒功率模式，光储一体供电单元向直流负荷供电的同时，也向包括蓄冰空调和其他母线上负荷在内的交流负荷供电。 During normal operation, switches 5, 7, 8, 10, 11, 12-18 and grid-connected switches PCC1, PCC2 are closed, and switches 6 and 9 are open. The grid-connected operation of the system is equivalent to connecting all distributed power sources and AC loads to a micro-grid bus. At this time, the triple power supply generator set and the energy storage device Bat are both running in constant power mode. The integrated optical storage power supply unit supplies power to DC loads, and also supplies power to AC loads including ice storage air conditioners and other bus loads.
故障模式分析 Failure Mode Analysis
a. 上级线路故障 a. Upper line failure
当线路1发生故障时，母线4失电，同时三联供发电机组内部的接触器断开，其内部保护检测到机端电压过低，执行保护动作，三联供发电机组进入热备状态。此时母线4所挂负荷处于无源状态，备自投开关6闭合，将母线4与母线5联通，由母线5向母线4的负荷提供电力，其中，只有在三联供发电机组内部接触器打开的情况下，才允许备自投开关6闭合。 When line 1 fails, bus 4 loses power, and at the same time, the contactor inside the triple power supply generator set is disconnected. Its internal protection detects that the machine terminal voltage is too low, executes a protection action, and the triple power supply generator set enters the hot standby state. At this time, the load attached to the bus 4 is in a passive state, and the backup switch 6 is closed to connect the bus 4 with the bus 5, and the bus 5 supplies power to the load of the bus 4, among which, only the internal contactor of the triple power supply generator set is opened In the case of the situation, the standby automatic switching switch 6 is allowed to be closed.
当线路2发生故障时，母线5失电，此时母线5所挂负荷处于无源状态，备自投开关6闭合，将母线5与母线4联通，由母线4向母线5的负荷提供电力。 When the line 2 fails, the bus 5 loses power. At this time, the load attached to the bus 5 is in a passive state. The backup switch 6 is closed to connect the bus 5 with the bus 4, and the bus 4 supplies power to the loads on the bus 5.
b. 母线故障 b. Bus failure
联网运行时，如果母线4故障，开关5执行保护动作，此时母线4失压，三联供发电机组检测到母线4故障，按照预设逻辑切换为离网模式，独立带负荷运行。此时不允许开关6闭合。 During networked operation, if the bus 4 fails, the switch 5 will perform protection action. At this time, the bus 4 loses voltage, and the triple power generator unit detects the failure of the bus 4, switches to the off-grid mode according to the preset logic, and operates independently with load. At this time, the switch 6 is not allowed to be closed.
如果母线5故障，开关7执行保护动作，此时母线5失压，光储一体供电单元检测到母线4故障，按照预设逻辑切换为离网模式，独立带负荷运行。此时不允许开关6闭合。 If the bus 5 fails, the switch 7 performs a protection action. At this time, the bus 5 loses voltage, and the optical-storage integrated power supply unit detects the failure of the bus 4, switches to the off-grid mode according to the preset logic, and operates independently with load. At this time, the switch 6 is not allowed to be closed.
在各种故障状态发生时，微网系统内负荷3和重要负荷负荷4均能得以供电保证。 When various fault states occur, both the load 3 and the important load 4 in the microgrid system can be guaranteed to supply power.
实施例三 Embodiment three
图3是本发明提供的一种交直流混合微网系统一个实施例的重要负荷供电设计结构图。如图3所示，本实施例实现了微网中重要负荷的供电。 Fig. 3 is a structural diagram of an important load power supply design of an embodiment of an AC/DC hybrid microgrid system provided by the present invention. As shown in FIG. 3 , this embodiment realizes the power supply of important loads in the microgrid.
为提高系统供电可靠性，可将部分负荷作为重要负荷对待，对其采用双电源自动切换供电设计，本实施例中，负荷4为重要负荷。如图3所示，开关9、开关10为负荷4的进线开关，两开关采用机械连锁设计，其动作逻辑为：假设正常运行时候，设定母线5为主供电源，开关9打开，开关10闭合；当母线5电源故障时，检测到母线失压，则开关9闭合，同时开关10打开，所有负荷由母线4供电。如果重新检测到母线5有压，则开关10闭合，同时连锁跳开开关9，恢复由母线5供电。 In order to improve the power supply reliability of the system, some loads can be treated as important loads, and a dual power supply automatic switching power supply design is adopted for them. In this embodiment, load 4 is an important load. As shown in Figure 3, switch 9 and switch 10 are the incoming line switches of the load 4, and the two switches adopt a mechanical interlocking design, and its action logic is: assuming normal operation, set the bus 5 as the main power supply, switch 9 is turned on, and the switch 10 is closed; when the power supply of the bus 5 fails, the bus voltage loss is detected, the switch 9 is closed, and the switch 10 is opened at the same time, and all loads are powered by the bus 4. If it is detected that the busbar 5 is under pressure again, the switch 10 will be closed, and at the same time, the chain trip switch 9 will be opened to restore the power supply by the busbar 5.
同样的，如果母线4为主供电源，则正常运行时，开关10打开，开关9闭合；当母线4电源故障时，检测到母线失压，则开关10闭合，同时开关9打开，所有负荷由母线5供电。如果重新检测到母线4有压，则开关9闭合，同时连锁跳开开关10，恢复由母线4供电。 Similarly, if the bus 4 is the main power supply, during normal operation, the switch 10 is opened and the switch 9 is closed; when the power supply of the bus 4 fails, the bus voltage loss is detected, the switch 10 is closed, and the switch 9 is opened at the same time, and all loads are powered by Bus 5 supplies power. If it is detected that the bus bar 4 is under pressure again, the switch 9 is closed, and at the same time, the chain trip switch 10 is opened, and the power supply by the bus bar 4 is resumed.
本实施例的重要负荷供电设计结构保证了重要负荷在正常供电母线故障情况下的电力供给。 The important load power supply design structure of this embodiment ensures the power supply of important loads in the event of a normal power supply bus failure.
本发明实施例提供的交直流混合微网系统，在保证现有供电结构的基础上进行升级，结构得到进一步强化，考虑了供电区域内不同类型负荷需求及不同等级电负荷需求，可以提高系统内所有负荷的供电可靠性，同时能实现微网内重要负荷的不间断高可靠性供电。 The AC/DC hybrid micro-grid system provided by the embodiment of the present invention is upgraded on the basis of ensuring the existing power supply structure, and the structure is further strengthened, taking into account different types of load requirements and different levels of electrical load requirements in the power supply area, which can improve the system capacity. The power supply reliability of all loads can realize uninterrupted and high-reliability power supply of important loads in the microgrid.
以上所揭露的仅为本发明较佳实施例而已，当然不能以此来限定本发明之权利范围，因此依本发明权利要求所作的等同变化，仍属本发明所涵盖的范围。 The above disclosures are only preferred embodiments of the present invention, and certainly cannot limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.
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