CN118783805A - A hybrid inverter and photovoltaic energy storage power supply system - Google Patents
A hybrid inverter and photovoltaic energy storage power supply system Download PDFInfo
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- CN118783805A CN118783805A CN202410909731.1A CN202410909731A CN118783805A CN 118783805 A CN118783805 A CN 118783805A CN 202410909731 A CN202410909731 A CN 202410909731A CN 118783805 A CN118783805 A CN 118783805A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 9
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 87
- 239000003990 capacitor Substances 0.000 claims abstract description 30
- 238000010586 diagram Methods 0.000 description 13
- 101100012902 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) FIG2 gene Proteins 0.000 description 7
- 101100233916 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) KAR5 gene Proteins 0.000 description 7
- 101000827703 Homo sapiens Polyphosphoinositide phosphatase Proteins 0.000 description 3
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- 238000000034 method Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/66—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal
- H02M7/68—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters
- H02M7/72—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
本发明涉及一种混合逆变器及光伏储能供电系统，属于电力领域，包括：MPPT电路、双向DC/AC电路和双向DC/DC电路；MPPT电路包括母线，母线上设置有第一电容C1；双向DC/AC电路的直流端与母线连接；双向DC/DC电路包括第一电感L1，第一开关管Q1、第二开关管Q2，第三开关管Q3、第一连接端、第二连接端。本发明的混合逆变器开关管可以减少1个，电感可以减少1个，驱动电路可以减少一半，因此器件少、驱动少、成本适中，可显著降低EMC问题，提高系统的可靠性。
The present invention relates to a hybrid inverter and a photovoltaic energy storage power supply system, belonging to the field of electric power, and comprising: an MPPT circuit, a bidirectional DC/AC circuit and a bidirectional DC/DC circuit; the MPPT circuit comprises a busbar, on which a first capacitor C1 is arranged; the DC end of the bidirectional DC/AC circuit is connected to the busbar; the bidirectional DC/DC circuit comprises a first inductor L1, a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a first connection end, and a second connection end. The hybrid inverter of the present invention can reduce one switch tube, one inductor, and half the drive circuit, so there are fewer devices, fewer drivers, and moderate costs, which can significantly reduce EMC problems and improve the reliability of the system.
Description
技术领域Technical Field
本发明涉及电力领域，具体涉及一种混合逆变器及光伏储能供电系统。The present invention relates to the field of electric power, and in particular to a hybrid inverter and a photovoltaic energy storage power supply system.
背景技术Background Art
目前光伏发电已取得广泛的应用，光伏发电在能源使用中的比例也在逐步提高。但是光伏发电具有间歇性和不稳定性，因此近年来带有储能功能的混合逆变器已逐步成为光伏逆变器的发展趋势。Photovoltaic power generation has been widely used, and its proportion in energy use is gradually increasing. However, photovoltaic power generation is intermittent and unstable, so hybrid inverters with energy storage function have gradually become the development trend of photovoltaic inverters in recent years.
与光伏逆变器相比，混合逆变器可以将白天生成的多余的电能储存在电池里，在本地负载或电网需要的时候再将这部分电能释放出来。Compared with photovoltaic inverters, hybrid inverters can store excess electricity generated during the day in batteries and release this energy when local loads or the grid need it.
如图11所示，是现有技术的一种混合逆变器的电路图，该混合逆变器包括MPPT电路100、双向DC/DC电路200和双向DC/AC电路300。在这种混合逆变器系统中，双向DC/DC电路200需要使用正负两套电路，因此磁性元件、开关管和驱动电路都需要两套，如其中的开关管共有4个：Q1、Q2、Q3、Q100，使用的器件多、成本高。正负两套电路不是完全解耦的，开关管的发波需要遵循严格的控制时序，否则很容易导致短路并进一步导致损坏。另外，电池正负端口对系统参考电位点的电压是高频跳动的，幅度为母线电压的一半，因此会导致很严重的EMC问题，从而进一步降低系统的可靠性，也需要花费更多的成本来解决EMC问题。As shown in FIG11 , it is a circuit diagram of a hybrid inverter in the prior art, and the hybrid inverter includes an MPPT circuit 100, a bidirectional DC/DC circuit 200, and a bidirectional DC/AC circuit 300. In this hybrid inverter system, the bidirectional DC/DC circuit 200 needs to use two sets of positive and negative circuits, so two sets of magnetic elements, switch tubes, and drive circuits are required. For example, there are 4 switch tubes: Q1, Q2, Q3, and Q100, and many devices are used, which is costly. The positive and negative circuits are not completely decoupled, and the wave generation of the switch tube needs to follow a strict control timing, otherwise it is easy to cause a short circuit and further damage. In addition, the voltage of the positive and negative ports of the battery to the system reference potential point is a high-frequency jump, and the amplitude is half of the bus voltage, which will cause very serious EMC problems, thereby further reducing the reliability of the system, and it is also necessary to spend more costs to solve the EMC problem.
发明内容Summary of the invention
为缓解或解决上述问题中的至少一个方面或者至少一点，提出本发明。The present invention is proposed to alleviate or solve at least one aspect or at least one point of the above problems.
本发明的一种混合逆变器，其特征在于：包括：MPPT电路、双向DC/AC电路和双向DC/DC电路；A hybrid inverter of the present invention is characterized by comprising: an MPPT circuit, a bidirectional DC/AC circuit and a bidirectional DC/DC circuit;
MPPT电路包括母线，母线上设置有第一电容C1；The MPPT circuit includes a bus bar, and a first capacitor C1 is arranged on the bus bar;
双向DC/AC电路的直流端与母线连接；The DC end of the bidirectional DC/AC circuit is connected to the busbar;
双向DC/DC电路包括第一电感L1，第一开关管Q1、第二开关管Q2，第三开关管Q3、第一连接端、第二连接端；双向DC/DC电路的第一连接端连接蓄电池的正极，第二连接端连接蓄电池的负极；The bidirectional DC/DC circuit includes a first inductor L1, a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a first connection end, and a second connection end; the first connection end of the bidirectional DC/DC circuit is connected to the positive electrode of the battery, and the second connection end is connected to the negative electrode of the battery;
电感L3的一端与第一输入端连接，另一端与第一开关管Q1的一端、第二开关管的一端分别连接；One end of the inductor L3 is connected to the first input end, and the other end is connected to one end of the first switch tube Q1 and one end of the second switch tube respectively;
第二连接端分别与第一开关管Q1的另一端，第三开关管Q3的一端连接；第二开关管Q2的另一端与母线的第一端连接，第三开关管Q3的另一端与母线的第二端连接。The second connection end is connected to the other end of the first switch tube Q1 and one end of the third switch tube Q3 respectively; the other end of the second switch tube Q2 is connected to the first end of the bus, and the other end of the third switch tube Q3 is connected to the second end of the bus.
优选的，双向DC/DC电路还包括第二电感L2，第二连接端通过第二电感L2后分别与第一开关管Q1的另一端，第三开关管Q3的一端连接。Preferably, the bidirectional DC/DC circuit further includes a second inductor L2, and the second connection end is respectively connected to the other end of the first switch tube Q1 and one end of the third switch tube Q3 through the second inductor L2.
优选的，MPPT电路包括第三连接端、第四连接端、第三电感L3、第四开关管Q4和第一二极管D1；第三电感L3的一端同时与第一二极管D1的一端、第四开关管Q4的一端连接，第三电感L3的另一端与第一连接端连接；第一二极管D1的另一端与母线的第一端连接；第二连接端同时与第四开关管Q4的另一端、母线的第二端连接。Preferably, the MPPT circuit includes a third connection terminal, a fourth connection terminal, a third inductor L3, a fourth switch tube Q4 and a first diode D1; one end of the third inductor L3 is simultaneously connected to one end of the first diode D1 and one end of the fourth switch tube Q4, and the other end of the third inductor L3 is connected to the first connection terminal; the other end of the first diode D1 is connected to the first end of the bus; and the second connection terminal is simultaneously connected to the other end of the fourth switch tube Q4 and the second end of the bus.
优选的，MPPT电路还包括第七连接端、第八连接端、第四电感L4、第二二极管D2、第五开关管Q5和第二电容C2，母线上串联设置有第一电容C1和第二电容C2；第四电感L4的一端同时与第二二极管D2的一端、第五开关管Q5的一端连接，第二二极管D2的另一端与母线的第一端连接。第四电感L4的另一端与第七连接端连接。第八连接端同时与第五开关管Q5的另一端、母线的第二端连接。Preferably, the MPPT circuit further includes a seventh connection terminal, an eighth connection terminal, a fourth inductor L4, a second diode D2, a fifth switch tube Q5, and a second capacitor C2, and a first capacitor C1 and a second capacitor C2 are arranged in series on the bus; one end of the fourth inductor L4 is simultaneously connected to one end of the second diode D2 and one end of the fifth switch tube Q5, and the other end of the second diode D2 is connected to the first end of the bus. The other end of the fourth inductor L4 is connected to the seventh connection terminal. The eighth connection terminal is simultaneously connected to the other end of the fifth switch tube Q5 and the second end of the bus.
优选的，双向DC/AC电路是H4桥、H5桥或Heric桥单母线拓扑。Preferably, the bidirectional DC/AC circuit is a H4 bridge, H5 bridge or Heric bridge single bus topology.
优选的，双向DC/AC电路是T型三电平或I型三电平双母线拓扑。Preferably, the bidirectional DC/AC circuit is a T-type three-level or I-type three-level double-busbar topology.
优选的，MPPT电路为多路输入电路。Preferably, the MPPT circuit is a multi-input circuit.
另外本发明还提供一种光伏储能供电系统，其特征在于：包括前述权利要求1-6中任一项所述的混合逆变器、PV光伏组串、电池组、AC电网、负载，混合逆变器分别与PV光伏组串、电池组、AC电网、负载连接。In addition, the present invention also provides a photovoltaic energy storage power supply system, characterized in that it includes a hybrid inverter, a PV photovoltaic string, a battery pack, an AC power grid, and a load as described in any one of claims 1 to 6, and the hybrid inverter is connected to the PV photovoltaic string, the battery pack, the AC power grid, and the load respectively.
本发明的混合逆变器及光伏储能供电系统，具有器件少、驱动少、成本适中、控制简单、无电压高频跳动和可靠性高等优点。The hybrid inverter and photovoltaic energy storage power supply system of the present invention have the advantages of fewer components, fewer drivers, moderate cost, simple control, no voltage high-frequency jump and high reliability.
与现有技术相比较，本发明的开关管可以减少1个，电感可以减少1个，驱动电路可以减少一半，因此器件少、驱动少、成本适中。本发明的开关管不需要区分工频管和高频管，因此控制简单，可靠性高。本发明的电池正负端口对系统参考电位点的电压是稳定的，不存在高频跳动，因此EMC性能更优，系统稳定性更高。Compared with the prior art, the switch tube of the present invention can be reduced by one, the inductor can be reduced by one, and the drive circuit can be reduced by half, so there are fewer devices, fewer drivers, and the cost is moderate. The switch tube of the present invention does not need to distinguish between power frequency tubes and high frequency tubes, so the control is simple and the reliability is high. The voltage of the positive and negative ports of the battery of the present invention to the system reference potential point is stable, and there is no high-frequency jump, so the EMC performance is better and the system stability is higher.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1为本发明实施例的光伏储能供电系统的功能框图。FIG1 is a functional block diagram of a photovoltaic energy storage power supply system according to an embodiment of the present invention.
图2为本发明实施例一的混合逆变器(H4桥)的电路示意图。FIG. 2 is a circuit diagram of a hybrid inverter (H4 bridge) according to the first embodiment of the present invention.
图3为本发明实施例二的混合逆变器(Heric桥)的电路示意图。FIG3 is a circuit diagram of a hybrid inverter (Heric bridge) according to a second embodiment of the present invention.
图4为本发明实施例三的混合逆变器(Heric桥)的电路示意图。FIG. 4 is a circuit diagram of a hybrid inverter (Heric bridge) according to a third embodiment of the present invention.
图5为本发明实施例五的混合逆变器(T型三电平(三相))的电路示意图。FIG5 is a circuit diagram of a hybrid inverter (T-type three-level (three-phase)) according to a fifth embodiment of the present invention.
图6为本发明实施例六的混合逆变器(T型三电平(三相))的电路示意图。FIG6 is a circuit diagram of a hybrid inverter (T-type three-level (three-phase)) according to a sixth embodiment of the present invention.
图7为本发明实施例七的混合逆变器(T型三电平(裂相))的电路示意图。FIG7 is a circuit diagram of a hybrid inverter (T-type three-level (split-phase)) according to a seventh embodiment of the present invention.
图8为本发明实施例八的混合逆变器(T型三电平(裂相))的电路示意图。FIG8 is a circuit diagram of a hybrid inverter (T-type three-level (split-phase)) according to an eighth embodiment of the present invention.
图9为本发明实施例九的混合逆变器(I型三电平(三相))的电路示意图。FIG9 is a circuit diagram of a hybrid inverter (type I three-level (three-phase)) according to a ninth embodiment of the present invention.
图10为本发明实施例十的混合逆变器(I型三电平(三相))的电路示意图。FIG10 is a circuit diagram of a hybrid inverter (I-type three-level (three-phase)) according to the tenth embodiment of the present invention.
图11为现有的混合逆变器(H4桥)的电路示意图。FIG. 11 is a circuit diagram of a conventional hybrid inverter (H4 bridge).
具体实施方式DETAILED DESCRIPTION
下述参照附图对本发明实施方式的说明旨在对本发明的总体发明构思进行解释，而不应当理解为对本发明的一种限制。在本发明中，相同的附图标记表示相同或相似的部件。The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention, and should not be construed as a limitation of the present invention. In the present invention, the same reference numerals represent the same or similar components.
在此描述的特征可以以不同的形式来实现，而不应被解释为限于在此描述的示例。相反，已提供在此描述的示例，以仅示出实现在此描述的方法、设备和/或系统的许多可行方式中的一些可行方式，所述许多可行方式在理解本发明的公开之后将是清楚的。The features described herein can be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided to illustrate only some of the many possible ways to implement the methods, devices, and/or systems described herein, which will be clear after understanding the disclosure of the present invention.
尽管在此可使用诸如“第一”、“第二”和“第三”的术语来描述各种构件、组件、区域、层或部分，但是这些构件、组件、区域、层或部分不应被这些术语所限制。相反，这些术语仅用于将一个构件、组件、区域、层或部分与另一构件、组件、区域、层或部分进行区分。Although terms such as "first", "second", and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions should not be limited by these terms. Instead, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion.
在说明书中，当元件(诸如，层、区域或基底)被描述为“在”另一元件上、“连接到”或“结合到”另一元件时，该元件可直接“在”另一元件上、直接“连接到”或“结合到”另一元件，或者可存在介于其间的一个或多个其他元件。相反，当元件被描述为“直接在”另一元件上、“直接连接到”或“直接结合到”另一元件时，可不存在介于其间的其他元件。In the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, or “coupled to” another element, the element may be directly “on”, “connected to”, or “coupled to” another element, or one or more other elements may be present therebetween. Conversely, when an element is described as being “directly on”, “directly connected to”, or “directly coupled to” another element, there may be no other elements present therebetween.
在此使用的术语仅用于描述各种示例，并不将用于限制公开。除非上下文另外清楚地指示，否则单数形式也意在包括复数形式。术语“包含”、“包括”和“具有”说明存在叙述的特征、数量、操作、构件、元件和/或它们的组合，但不排除存在或添加一个或多个其他特征、数量、操作、构件、元件和/或它们的组合。The terms used herein are only used to describe various examples and are not intended to limit the disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "comprise", "include" and "have" indicate the presence of the described features, quantities, operations, components, elements and/or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements and/or combinations thereof.
为了使得本领域技术人员能够使用本发明的内容，下文中可能结合特定的应用场景、特定的系统、器件和元件的参数以及特定的连接方式，给出以下示例性实施例。然而，对于本领域技术人员来说，这些实施例仅是示例，在不脱离本发明的精神和范围的情况下，可以将这里定义的一般原理应用于其他实施例和应用场景。In order to enable those skilled in the art to use the contents of the present invention, the following exemplary embodiments may be provided in combination with specific application scenarios, specific systems, parameters of devices and components, and specific connection methods. However, for those skilled in the art, these embodiments are only examples, and the general principles defined herein may be applied to other embodiments and application scenarios without departing from the spirit and scope of the present invention.
根据本发明的一个示例性实施例：如图1所示为本文所公开的各种实施例的混合逆变器系统的功能框图。电池组101、PV光伏组串102和AC电网103被输入到混合逆变器104。混合逆变器104内部包括MPPT电路100、双向DC/DC电路200和双向DC/AC电路300。According to an exemplary embodiment of the present invention: FIG1 is a functional block diagram of a hybrid inverter system according to various embodiments disclosed herein. A battery pack 101, a PV photovoltaic string 102, and an AC grid 103 are input to a hybrid inverter 104. The hybrid inverter 104 includes an MPPT circuit 100, a bidirectional DC/DC circuit 200, and a bidirectional DC/AC circuit 300.
当PV光伏组串102产生的电量充足时，混合逆变器104中产生的电量优先给负载105供电，多余的电量给电池组101充电，剩余的电量出售给AC电网103。When the power generated by the PV photovoltaic string 102 is sufficient, the power generated in the hybrid inverter 104 is used to supply power to the load 105 first, the excess power is used to charge the battery group 101, and the remaining power is sold to the AC grid 103.
当PV光伏组串102产生的电量不足或未产生电量时，优先使用电池组101的电量给负载105供电，如电池组101的电量不足，则由AC电网103给负载105供电。When the PV photovoltaic string 102 generates insufficient power or no power, the power of the battery group 101 is preferentially used to power the load 105 . If the power of the battery group 101 is insufficient, the AC power grid 103 powers the load 105 .
实施例一Embodiment 1
如图2所示，本发明的混合逆变器，包括：MPPT电路、双向DC/AC电路和双向DC/DC电路。双向DC/DC电路包括第一连接端、第二连接端、第一电感L1，第一开关管Q1、第二开关管Q2、第三开关管Q3，双向DC/DC电路的第一连接端连接蓄电池的正极BAT+，第二连接端连接蓄电池的负极BAT-。As shown in FIG2 , the hybrid inverter of the present invention includes: an MPPT circuit, a bidirectional DC/AC circuit and a bidirectional DC/DC circuit. The bidirectional DC/DC circuit includes a first connection terminal, a second connection terminal, a first inductor L1, a first switch tube Q1, a second switch tube Q2, and a third switch tube Q3. The first connection terminal of the bidirectional DC/DC circuit is connected to the positive electrode BAT+ of the battery, and the second connection terminal is connected to the negative electrode BAT- of the battery.
第一电感L1的一端与第一连接端连接，另一端与第一开关管Q1的一端、第二开关管Q2的一端分别连接。One end of the first inductor L1 is connected to the first connection end, and the other end of the first inductor L1 is connected to one end of the first switch tube Q1 and one end of the second switch tube Q2 respectively.
第二连接端分别与第一开关管Q1的另一端，第三开关管Q3的一端连接；第二开关管Q2的另一端与母线的第一端连接，第三开关管Q3的另一端与母线的第二端连接。The second connection end is connected to the other end of the first switch tube Q1 and one end of the third switch tube Q3 respectively; the other end of the second switch tube Q2 is connected to the first end of the bus, and the other end of the third switch tube Q3 is connected to the second end of the bus.
如图2所示，MPPT电路包括母线，母线上设置有第一电容C1，母线的第一端连接双向DC/AC电路的直流侧的第一端，母线的第二端连接双向DC/AC电路的直流侧的第二端。As shown in FIG2 , the MPPT circuit includes a bus bar, on which a first capacitor C1 is arranged, a first end of the bus bar is connected to a first end of a DC side of a bidirectional DC/AC circuit, and a second end of the bus bar is connected to a second end of a DC side of the bidirectional DC/AC circuit.
MPPT电路包括第三连接端、第四连接端、第三电感L3、第四开关管Q4和第一二极管D1。第三电感L3的一端同时与第一二极管D1的一端、第四开关管Q4的一端连接，第三电感L3的另一端与第一连接端连接；第一二极管D1的另一端与母线的第一端连接；第二连接端同时与第四开关管Q4的另一端、母线的第二端连接。第三连接端可与光伏的正极PV+连接，第四连接端可与光伏的负极PV-连接。The MPPT circuit includes a third connection terminal, a fourth connection terminal, a third inductor L3, a fourth switch tube Q4 and a first diode D1. One end of the third inductor L3 is simultaneously connected to one end of the first diode D1 and one end of the fourth switch tube Q4, and the other end of the third inductor L3 is connected to the first connection terminal; the other end of the first diode D1 is connected to the first end of the bus; the second connection terminal is simultaneously connected to the other end of the fourth switch tube Q4 and the second end of the bus. The third connection terminal can be connected to the positive pole PV+ of the photovoltaic, and the fourth connection terminal can be connected to the negative pole PV- of the photovoltaic.
如图2所示，其中双向DC/AC电路采用H4桥电路结构，其包括第六开关管Q6、第七开关管Q7、第十开关管Q10、第十一开关管Q11、第五电感L5、第六电感L6、第三电容C3、第五连接端、第六连接端。H4桥的一边两个接口分别连接母线的第一端和第二端，H4桥的另一边的两个接口分别连接第五电感的一端、第六电感L6的一端，第五电感L5的另一端同时连接第三电容的一端和第五连接端，第六电感L6的另一端同时连接第三电容C3的另一端和第六连接端。第五连接端连接外接电网L端，第六连接端连接外接电网的N端。As shown in FIG2 , the bidirectional DC/AC circuit adopts an H4 bridge circuit structure, which includes a sixth switch tube Q6, a seventh switch tube Q7, a tenth switch tube Q10, an eleventh switch tube Q11, a fifth inductor L5, a sixth inductor L6, a third capacitor C3, a fifth connection end, and a sixth connection end. Two interfaces on one side of the H4 bridge are respectively connected to the first end and the second end of the busbar, and two interfaces on the other side of the H4 bridge are respectively connected to one end of the fifth inductor and one end of the sixth inductor L6. The other end of the fifth inductor L5 is simultaneously connected to one end of the third capacitor and the fifth connection end, and the other end of the sixth inductor L6 is simultaneously connected to the other end of the third capacitor C3 and the sixth connection end. The fifth connection end is connected to the L end of the external power grid, and the sixth connection end is connected to the N end of the external power grid.
实施例二Embodiment 2
如图3所示，本发明的混合逆变器，包括：MPPT电路、双向DC/AC电路和双向DC/DC电路。其与图2中的MPPT电路、双向DC/DC的电路结构完全相同。其与图2的实施例的不同之处在于，图3中的双向DC/AC电路采用Heric桥电路结构，其包括第六开关管Q6、第七开关管Q7、第八开关管Q8、第九开关管Q9、第十开关管Q10、第十一开关管Q11、第五电感L5、第六电感L6、第三电容C3、第五连接端、第六连接端。As shown in FIG3 , the hybrid inverter of the present invention includes: an MPPT circuit, a bidirectional DC/AC circuit and a bidirectional DC/DC circuit. The circuit structure of the MPPT circuit and the bidirectional DC/DC in FIG2 is exactly the same. The difference between the embodiment of the embodiment of FIG2 and the bidirectional DC/AC circuit in FIG3 is that the bidirectional DC/AC circuit in FIG3 adopts a Heric bridge circuit structure, which includes a sixth switch tube Q6, a seventh switch tube Q7, an eighth switch tube Q8, a ninth switch tube Q9, a tenth switch tube Q10, an eleventh switch tube Q11, a fifth inductor L5, a sixth inductor L6, a third capacitor C3, a fifth connection terminal, and a sixth connection terminal.
双向DC/AC电路一边两个接口分别连接母线的第一端和第二端，第五连接端连接外接电网L端，第六连接端连接外接电网的N端。Two interfaces on one side of the bidirectional DC/AC circuit are respectively connected to the first end and the second end of the busbar, the fifth connection end is connected to the L end of the external power grid, and the sixth connection end is connected to the N end of the external power grid.
实施例三Embodiment 3
如图4所示，本发明的混合逆变器，包括：MPPT电路、双向DC/AC电路和双向DC/DC电路。其与图3中的MPPT电路、双向DC/AC的电路结构完全相同。其与图3的实施例的不同之处在于，其中双向DC/DC电路还包括第二电感L2。As shown in FIG4 , the hybrid inverter of the present invention includes: an MPPT circuit, a bidirectional DC/AC circuit and a bidirectional DC/DC circuit. The circuit structure of the MPPT circuit and the bidirectional DC/AC circuit are exactly the same as those of the MPPT circuit and the bidirectional DC/AC circuit in FIG3 . The difference between the embodiment of FIG3 and the embodiment of FIG3 is that the bidirectional DC/DC circuit further includes a second inductor L2.
如图4所示，双向DC/DC电路包括第一连接端、第二连接端、第一电感L1、第二电感L2、第一开关管Q1、第二开关管Q2、第三开关管Q3。双向DC/DC电路的第一连接端连接蓄电池的正极BAT+，第二连接端连接蓄电池的负极BAT-。As shown in Fig. 4, the bidirectional DC/DC circuit includes a first connection terminal, a second connection terminal, a first inductor L1, a second inductor L2, a first switch tube Q1, a second switch tube Q2, and a third switch tube Q3. The first connection terminal of the bidirectional DC/DC circuit is connected to the positive electrode BAT+ of the battery, and the second connection terminal is connected to the negative electrode BAT- of the battery.
第一电感L1的一端与第一连接端连接，另一端与第一开关管Q1的一端、第二开关管Q2的一端分别连接。第二电感L2的一端与第二连接端连接，另一端分别与第一开关管Q1的另一端，第三开关管Q3的一端连接。One end of the first inductor L1 is connected to the first connection end, and the other end is connected to one end of the first switch tube Q1 and one end of the second switch tube Q2. One end of the second inductor L2 is connected to the second connection end, and the other end is connected to the other end of the first switch tube Q1 and one end of the third switch tube Q3.
第二开关管Q2的另一端与母线的第一端连接，第三开关管Q3的另一端与母线的第二端连接。The other end of the second switch tube Q2 is connected to the first end of the bus bar, and the other end of the third switch tube Q3 is connected to the second end of the bus bar.
实施例四Embodiment 4
如图5所示，本发明的混合逆变器，包括：MPPT电路、双向DC/AC电路和双向DC/DC电路。其中，双向DC/DC电路和图4中的双向DC/DC电路结构完全相同。其与图4中的不同之处在于，MPPT电路为多路结构。As shown in FIG5 , the hybrid inverter of the present invention includes: an MPPT circuit, a bidirectional DC/AC circuit and a bidirectional DC/DC circuit. The bidirectional DC/DC circuit has the same structure as the bidirectional DC/DC circuit in FIG4 . The difference between the bidirectional DC/DC circuit and the bidirectional DC/DC circuit in FIG4 is that the MPPT circuit is a multi-channel structure.
如图5所示，MPPT电路包括母线，母线上串联设置有第一电容C1和第二电容C2。MPPT电路包括第三连接端、第四连接端、第七连接端、第八连接端，第三电感L3、第四电感L4.As shown in FIG5 , the MPPT circuit includes a busbar, on which a first capacitor C1 and a second capacitor C2 are connected in series. The MPPT circuit includes a third connection terminal, a fourth connection terminal, a seventh connection terminal, an eighth connection terminal, a third inductor L3, and a fourth inductor L4.
第三电感L3的一端同时与第一二极管D1的一端、第四开关管Q4的一端连接，第一二极管D1的另一端与母线的第一端连接。第三电感L3的另一端与第三连接端连接。第四连接端同时与第四开关管Q4的另一端、母线的第二端连接。第三连接端可与光伏的正极PV+连接，第四连接端可与光伏的负极PV-连接。One end of the third inductor L3 is simultaneously connected to one end of the first diode D1 and one end of the fourth switch tube Q4, and the other end of the first diode D1 is connected to the first end of the busbar. The other end of the third inductor L3 is connected to the third connection end. The fourth connection end is simultaneously connected to the other end of the fourth switch tube Q4 and the second end of the busbar. The third connection end can be connected to the positive pole PV+ of the photovoltaic, and the fourth connection end can be connected to the negative pole PV- of the photovoltaic.
第四电感L4的一端同时与第二二极管D2的一端、第五开关管Q5的一端连接，第二二极管D2的另一端与母线的第一端连接。第四电感L4的另一端与第七连接端连接。第八连接端同时与第五开关管Q5的另一端、母线的第二端连接。第七连接端可与光伏的正极PV2+连接，第八连接端可与光伏的负极PV-连接。One end of the fourth inductor L4 is simultaneously connected to one end of the second diode D2 and one end of the fifth switch tube Q5, and the other end of the second diode D2 is connected to the first end of the busbar. The other end of the fourth inductor L4 is connected to the seventh connection end. The eighth connection end is simultaneously connected to the other end of the fifth switch tube Q5 and the second end of the busbar. The seventh connection end can be connected to the positive pole PV2+ of the photovoltaic, and the eighth connection end can be connected to the negative pole PV- of the photovoltaic.
如图5所示，其中的双向DC/AC电路为T型三电平结构，其包括第六开关管Q6、第七开关管Q7、第八开关管Q8、第九开关管Q9、第十开关管Q10、第十一开关管Q11、第十二开关管Q12、第十三开关管Q13、第十四开关管Q14、第十五开关管Q15、第十六开关管Q16、第十七开关管Q17、第五电感L5、第六电感L6、第七电感L7、第三电容C3、第四电容C4、第五电容C5，双向DC/AC电路一边的接口分别连接母线的第一端、第二端、第一电容C1与第二电容C2的串接点上，双向DC/AC电路的另一边接口分别连接三相外接接口L-1，L-2，L-3和N接口上。As shown in FIG5 , the bidirectional DC/AC circuit is a T-type three-level structure, which includes a sixth switch tube Q6, a seventh switch tube Q7, an eighth switch tube Q8, a ninth switch tube Q9, a tenth switch tube Q10, an eleventh switch tube Q11, a twelfth switch tube Q12, a thirteenth switch tube Q13, a fourteenth switch tube Q14, a fifteenth switch tube Q15, a sixteenth switch tube Q16, a seventeenth switch tube Q17, a fifth inductor L5, a sixth inductor L6, a seventh inductor L7, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5. An interface on one side of the bidirectional DC/AC circuit is respectively connected to the first end and the second end of the bus and the series connection point of the first capacitor C1 and the second capacitor C2. An interface on the other side of the bidirectional DC/AC circuit is respectively connected to the three-phase external interfaces L-1, L-2, L-3 and the N interface.
实施例五Embodiment 5
如图6所示，本发明的混合逆变器，包括：MPPT电路、双向DC/AC电路和双向DC/DC电路。其中，MPPT电路、双向DC/AC电路与图5中的结构完全相同，其与图5的不同之处，仅在于，其双向DC/DC电路不同，其双向DC/DC电路与图2中的双向DC/DC电路结构完全相同，在此不再赘述。As shown in Fig. 6, the hybrid inverter of the present invention includes: an MPPT circuit, a bidirectional DC/AC circuit and a bidirectional DC/DC circuit. Among them, the MPPT circuit and the bidirectional DC/AC circuit are exactly the same as those in Fig. 5. The only difference between them and Fig. 5 is that the bidirectional DC/DC circuit is different. The bidirectional DC/DC circuit has the same structure as the bidirectional DC/DC circuit in Fig. 2, which will not be repeated here.
实施例六Embodiment 6
如图7所示，本发明的混合逆变器，包括：MPPT电路、双向DC/AC电路和双向DC/DC电路。其中，MPPT电路、双向DC/DC电路与图5中的结构完全相同，其与图5的不同之处，仅在于，其双向DC/AC电路不同，其双向DC/AC电路采用T型三电平(裂相)结构。As shown in Fig. 7, the hybrid inverter of the present invention includes: an MPPT circuit, a bidirectional DC/AC circuit and a bidirectional DC/DC circuit. Among them, the MPPT circuit and the bidirectional DC/DC circuit are exactly the same as those in Fig. 5, and the difference between them and Fig. 5 is that the bidirectional DC/AC circuit is different, and the bidirectional DC/AC circuit adopts a T-type three-level (split phase) structure.
如图7所示，双向DC/AC电路包括第六开关管Q6、第七开关管Q7、第八开关管Q8、第九开关管Q9、第十开关管Q10、第十一开关管Q11、第十二开关管Q12、第十三开关管Q13、第五电感L5、第六电感L6、第三电容C3、第四电容C4，双向DC/AC电路一边的接口分别连接母线的第一端、第二端、第一电容C1与第二电容C2的串接点上，双向DC/AC电路的另一边接口分别连接三相外接接口L-1，L-2和N接口上。As shown in FIG7 , the bidirectional DC/AC circuit includes a sixth switch tube Q6, a seventh switch tube Q7, an eighth switch tube Q8, a ninth switch tube Q9, a tenth switch tube Q10, an eleventh switch tube Q11, a twelfth switch tube Q12, a thirteenth switch tube Q13, a fifth inductor L5, a sixth inductor L6, a third capacitor C3, and a fourth capacitor C4. Interfaces on one side of the bidirectional DC/AC circuit are respectively connected to the first end and the second end of the bus and the series connection point of the first capacitor C1 and the second capacitor C2. Interfaces on the other side of the bidirectional DC/AC circuit are respectively connected to the three-phase external interfaces L-1, L-2 and N interface.
实施例七Embodiment 7
如图8所示，本发明的混合逆变器，包括：MPPT电路、双向DC/AC电路和双向DC/DC电路。其中，MPPT电路、双向DC/AC电路与图7中的结构完全相同，其与图7的不同之处，仅在于，其双向DC/DC电路不同，此处的双向DC/DC电路采用图2中的双向DC/DC电路。As shown in FIG8 , the hybrid inverter of the present invention includes: an MPPT circuit, a bidirectional DC/AC circuit and a bidirectional DC/DC circuit. The MPPT circuit and the bidirectional DC/AC circuit are exactly the same as those in FIG7 , and the difference between the MPPT circuit and the bidirectional DC/AC circuit is that the bidirectional DC/DC circuit is different, and the bidirectional DC/DC circuit here adopts the bidirectional DC/DC circuit in FIG2 .
实施例八Embodiment 8
如图9所示，本发明的混合逆变器，包括：MPPT电路、双向DC/AC电路和双向DC/DC电路。其中，MPPT电路、双向DC/DC电路与图6中的结构完全相同，其与图6的不同之处，仅在于，其双向DC/AC电路不同，其双向DC/AC电路采用I型三电平(三相)结构。As shown in Fig. 9, the hybrid inverter of the present invention includes: an MPPT circuit, a bidirectional DC/AC circuit and a bidirectional DC/DC circuit. The MPPT circuit and the bidirectional DC/DC circuit are exactly the same as those in Fig. 6, and the difference between the MPPT circuit and the bidirectional DC/DC circuit is that the bidirectional DC/AC circuit is different and adopts an I-type three-level (three-phase) structure.
如图9所示，双向DC/AC电路包括其包括第六开关管Q6、第七开关管Q7、第八开关管Q8、第九开关管Q9、第十开关管Q10、第十一开关管Q11、第十二开关管Q12、第十三开关管Q13、第十四开关管Q14、第十五开关管Q15、第十六开关管Q16、第十七开关管Q17、第五电感L5、第六电感L6、第七电感L7、第三电容C3、第四电容C4、第五电容C5，双向DC/AC电路一边的接口分别连接母线的第一端、第二端、第一电容C1与第二电容C2的串接点上，双向DC/AC电路的另一边接口分别连接三相外接接口L-1，L-2，L-3和N接口上。As shown in FIG9 , the bidirectional DC/AC circuit includes a sixth switch tube Q6, a seventh switch tube Q7, an eighth switch tube Q8, a ninth switch tube Q9, a tenth switch tube Q10, an eleventh switch tube Q11, a twelfth switch tube Q12, a thirteenth switch tube Q13, a fourteenth switch tube Q14, a fifteenth switch tube Q15, a sixteenth switch tube Q16, a seventeenth switch tube Q17, a fifth inductor L5, a sixth inductor L6, a seventh inductor L7, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5. An interface on one side of the bidirectional DC/AC circuit is respectively connected to the first end and the second end of the bus and the series connection point of the first capacitor C1 and the second capacitor C2. An interface on the other side of the bidirectional DC/AC circuit is respectively connected to the three-phase external interfaces L-1, L-2, L-3 and the N interface.
实施例九Embodiment 9
如图10所示，本发明的混合逆变器，包括：MPPT电路、双向DC/AC电路和双向DC/DC电路。其中，MPPT电路、双向DC/AC电路与图9中的结构完全相同，其与图9的不同之处，仅在于，其双向DC/DC电路不同，此处的双向DC/DC电路采用图2中的双向DC/DC电路。As shown in FIG10 , the hybrid inverter of the present invention includes: an MPPT circuit, a bidirectional DC/AC circuit and a bidirectional DC/DC circuit. The MPPT circuit and the bidirectional DC/AC circuit are exactly the same as those in FIG9 , and the difference between the MPPT circuit and the bidirectional DC/AC circuit is that the bidirectional DC/DC circuit is different, and the bidirectional DC/DC circuit here adopts the bidirectional DC/DC circuit in FIG2 .
本发明的混合逆变器及光伏储能供电系统，具有器件少、驱动少、成本适中、控制简单、无电压高频跳动和可靠性高等优点。本发明的开关管可以减少1个，电感可以减少1个，驱动电路可以减少一半，因此器件少、驱动少、成本适中。The hybrid inverter and photovoltaic energy storage power supply system of the present invention have the advantages of fewer components, fewer drivers, moderate cost, simple control, no voltage high-frequency jump and high reliability. The present invention can reduce one switch tube, one inductor and half the drive circuit, so there are fewer components, fewer drivers and moderate cost.
本发明的开关管不需要区分工频管和高频管，因此控制简单，可靠性高。本发明的电池正负端口对系统参考电位点的电压是稳定的，不存在高频跳动，因此EMC性能更优，系统稳定性更高。The switch tube of the present invention does not need to distinguish between power frequency tubes and high frequency tubes, so the control is simple and the reliability is high. The voltage of the positive and negative ports of the battery of the present invention to the system reference potential point is stable, and there is no high frequency jump, so the EMC performance is better and the system stability is higher.
尽管已经示出和描述了本发明的实施例，对于本领域的普通技术人员而言，可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行变化、要素组合，本发明的范围由所附权利要求及其等同物限定。Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to the embodiments and combinations of elements may be made without departing from the principles and spirit of the invention, the scope of the invention being defined by the appended claims and their equivalents.
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