CN202616801U - Photovoltaic/ storage-battery hybrid distribution-type power generation system based on current inverter - Google Patents
Photovoltaic/ storage-battery hybrid distribution-type power generation system based on current inverter Download PDFInfo
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Abstract
Description
技术领域 technical field
本实用新型涉及一种发电系统,具体涉及一种基于电流逆变器的光伏/蓄电池混合型分布式发电系统,属于电工、电力电子、新能源发电技术领域。The utility model relates to a power generation system, in particular to a photovoltaic/storage battery hybrid distributed power generation system based on a current inverter, and belongs to the technical fields of electrician, power electronics and new energy power generation.
背景技术 Background technique
目前大功率并网逆变器主要有电压源型和电流源型两大类。由于直流母线电压恒定、交流电压控制直接、及电压源型变换器开关器件广泛使用,目前大部分逆变型分布发电研究都是基于电压源型逆变器。相比电压逆变型发电,电流逆变型分布发电具有自身的特点:(1)拓扑结构简单。(2)逆变器输出电压波形好,dv/dt小。(3)逆变器PWM策略简单。(4)短路电流保护能力强。电网发生短路故障时,逆变器直流侧电感有着较好的限流作用。(5)由于输出波形接近正弦波,逆变器的并网电缆长度允许较长。(6)电流型逆变器自身具有升压功能。可将可再生能源(如光伏电池)输出直接通过逆变器接入电网,无需DC/DC升压变换器。(7)部分直流母线电感可利用电缆的电感效应来实现,直流母线电感具有较长的寿命。(8)电流逆变型分布发电动态性能完全可满足风力、光伏等可再生能源功率变化要求。At present, there are two main types of high-power grid-connected inverters: voltage source type and current source type. Due to the constant DC bus voltage, direct AC voltage control, and the widespread use of switching devices in voltage source converters, most current research on inverter-type distributed generation is based on voltage source inverters. Compared with voltage inversion power generation, current inversion distributed power generation has its own characteristics: (1) The topology is simple. (2) The output voltage waveform of the inverter is good, and the dv/dt is small. (3) The inverter PWM strategy is simple. (4) Strong short-circuit current protection capability. When a short-circuit fault occurs in the power grid, the inductance on the DC side of the inverter has a good current limiting effect. (5) Since the output waveform is close to a sine wave, the grid-connected cable length of the inverter is allowed to be longer. (6) The current source inverter itself has a boost function. The output of renewable energy (such as photovoltaic cells) can be directly connected to the grid through the inverter, without the need for a DC/DC boost converter. (7) Part of the DC bus inductance can be realized by using the inductance effect of the cable, and the DC bus inductance has a long life. (8) The dynamic performance of current inverter distributed power generation can fully meet the power change requirements of wind power, photovoltaic and other renewable energy sources.
目前国内外绝大多数光伏并网发电系统均是基于电压源型逆变器的,而电流逆变型并网发电系统很少;且基于电流型逆变器的蓄电池充放电系统也非常少。At present, most photovoltaic grid-connected power generation systems at home and abroad are based on voltage source inverters, while current inverter-type grid-connected power generation systems are rare; and battery charging and discharging systems based on current-source inverters are also very few.
由于光伏等可再生能源发电系统的输出功率具有间歇性的特点,因此给输电电网带来的不稳定因素,限制了基于可再生能源分布发电的大规模并网。所以实际中需要储能系统如蓄电池系统参与输出功率的平滑,来补偿可再生能源的不稳定输出功率。另一方面,当主电网进行检修或发生故障时,基于可再生能源的分布发电会从主电网中断开,和当地负荷一起形成孤岛电网,这时分布发电需给孤岛电网中的当地负荷提供能源。而基于可再生能源的分布发电由于其输出功率不稳定,和孤岛电网中的当地用电负荷不能平衡,因此必需借助储能系统配合来填补分布发电系统输出功率和孤岛电网中当地用电负荷之间的功率差异。Due to the intermittent characteristics of the output power of renewable energy generation systems such as photovoltaics, the unstable factors brought to the transmission grid limit the large-scale grid connection based on distributed generation of renewable energy. Therefore, in practice, energy storage systems such as battery systems are required to participate in the smoothing of output power to compensate for the unstable output power of renewable energy. On the other hand, when the main grid is overhauled or fails, the distributed generation based on renewable energy will be disconnected from the main grid and form an island grid together with the local load. At this time, the distributed generation needs to provide energy for the local load in the island grid . However, due to the unstable output power of distributed power generation based on renewable energy, it cannot balance with the local power load in the island grid. Therefore, it is necessary to use the energy storage system to fill the gap between the output power of the distributed power generation system and the local power load in the island grid. power difference between them.
传统的光伏和蓄电池系统通过各自的并网逆变器在电网侧相联,这样需要至少两套并网逆变器,从而增加了系统的成本。Traditional photovoltaic and battery systems are connected on the grid side through their own grid-connected inverters, which requires at least two sets of grid-connected inverters, which increases the cost of the system.
实用新型内容 Utility model content
针对现有技术存在的不足,本实用新型目的是提供一种可降低成本、且具有电流型并网逆变器优点的基于电流逆变器的光伏/蓄电池混合型分布式发电系统,不仅可平滑光伏电池板的不稳定功率输出,而且在孤岛电网下具有支撑电网电压的能力。Aiming at the deficiencies in the existing technology, the purpose of this utility model is to provide a photovoltaic/battery hybrid distributed power generation system based on a current inverter that can reduce costs and has the advantages of a current-mode grid-connected inverter. The unstable power output of photovoltaic panels, and the ability to support the grid voltage under the island grid.
为了实现上述目的,本实用新型是通过如下的技术方案来实现:In order to achieve the above object, the utility model is realized through the following technical solutions:
本实用新型包括第一电压/电流变换器或串联的第二电压/电流变换器与第三电压/电流变换器,均用于将电压转换成电流;蓄电池;双向功率升压直流/直流变换器,与蓄电池相连接,用于对蓄电池进行充放电;光伏电池板;单向功率升压直流/直流变换器,与光伏电池板输出端相连接,用于将光伏电池板发出的能量传送给第一电压/电流变换器或第三电压/电流变换器;和电流型并网逆变器,与电网输入端相连接,用于将第一电压/电流变换器或第二电压/电流变换器及第三电压/电流变换器输出的直流电流转换成交流电流;双向功率升压直流/直流变换器和单向功率升压直流/直流变换器输出端均通过第一电压/电流变换器与电流型并网逆变器输入端相连接,或双向功率升压直流/直流变换器和单向功率升压直流/直流变换器输出端分别通过第二电压/电流变换器和第三电压/电流变换器与电流型并网逆变器输入端相连接。The utility model comprises a first voltage/current converter or a second voltage/current converter and a third voltage/current converter connected in series, both of which are used to convert voltage into current; a storage battery; a bidirectional power step-up DC/DC converter , connected to the battery, used to charge and discharge the battery; photovoltaic panels; unidirectional power step-up DC/DC converter, connected to the output of the photovoltaic panels, used to transmit the energy emitted by the photovoltaic panels to the second a voltage/current converter or a third voltage/current converter; and a current-type grid-connected inverter connected to the input terminal of the grid for connecting the first voltage/current converter or the second voltage/current converter and The DC current output by the third voltage/current converter is converted into AC current; the output ends of the bidirectional power boosting DC/DC converter and the unidirectional power boosting DC/DC converter pass through the first voltage/current converter and the current type The input terminals of the grid-connected inverter are connected, or the output terminals of the bidirectional power boost DC/DC converter and the unidirectional power boost DC/DC converter pass through the second voltage/current converter and the third voltage/current converter respectively Connect with the input end of the current source grid-connected inverter.
上述蓄电池、光伏电池板、双向功率升压直流/直流变换器和单向功率升压直流/直流变换器的两输出端均并联有电容,用于减小电压纹波。Capacitors are connected in parallel at both output ends of the storage battery, the photovoltaic battery panel, the bidirectional power boost DC/DC converter and the unidirectional power boost DC/DC converter to reduce voltage ripple.
上述电流型并网逆变器通过电感与电网相连接,用于减小并网电流谐波,实现并网电流控制。The above-mentioned current-source grid-connected inverter is connected to the grid through an inductor, and is used to reduce grid-connected current harmonics and realize grid-connected current control.
上述系统结构具有一般性,可适用于其它可再生能源和储能系统的集成。其中,光伏电池板可由燃料电池取代,蓄电池可由超级电容取代。The above system structure is general and applicable to the integration of other renewable energy and energy storage systems. Among them, photovoltaic panels can be replaced by fuel cells, and batteries can be replaced by supercapacitors.
本实用新型所提出的光伏/蓄电池系统基于电流型并网逆变器,因此具有电流逆变型分布式发电拓扑结构简单、故障电流保护能力强、具有升压功能、直流侧储能器件电感寿命长等优点;本实用新型的光伏系统和蓄电池系统共用一个电流型并网逆变器,节约了成本,而且控制直接、简单;本实用新型将蓄电池和光伏系统在直流侧有效集成,不仅可平滑光伏电池板的不稳定功率输出,而且使系统具有在孤岛电网下具有支撑电网电压的能力;当电网发生短路故障时,光伏中能量能够有效存储到蓄电池中,避免了并网电流过流。The photovoltaic/battery system proposed by the utility model is based on a current-type grid-connected inverter, so it has a current-inversion type distributed power generation with a simple topological structure, strong fault current protection capability, boosting function, and long life of the inductance of the energy storage device on the DC side. Long and other advantages; the photovoltaic system and the battery system of the utility model share a current-type grid-connected inverter, which saves costs, and the control is direct and simple; the utility model effectively integrates the battery and the photovoltaic system on the DC side, not only smooth The unstable power output of photovoltaic panels also enables the system to have the ability to support the grid voltage under the island grid; when a short-circuit fault occurs in the grid, the energy in the photovoltaic can be effectively stored in the battery, avoiding the overcurrent of grid-connected current.
附图说明 Description of drawings
图1为本实用新型所提出的基于电流逆变器的光伏/蓄电池并联混合型分布式发电系统结构示意图;Fig. 1 is a schematic structural diagram of a photovoltaic/battery parallel hybrid distributed power generation system based on a current inverter proposed by the present invention;
图2为本实用新型所提出的基于电流逆变器的光伏/蓄电池串联混合型分布式发电系统结构示意图;Fig. 2 is a schematic structural diagram of a photovoltaic/battery series hybrid distributed power generation system based on a current inverter proposed by the present invention;
图3为本实用新型所提出的基于电流逆变器的光伏/蓄电池混合型分布式发电系统的具体实施方案示意图。Fig. 3 is a schematic diagram of a specific embodiment of a photovoltaic/battery hybrid distributed power generation system based on a current inverter proposed by the present invention.
图中各标号:蓄电池1,双向功率升压直流/直流变换器2,光伏电池板3,单向功率升压直流/直流变换器4,第一电压/电流变换器5-1,第二电压/电流变换器5-2,第三电压/电流变换器5-3,电流型并网逆变器6,电网7,电流逆变型光伏发电系统8,非线性负载9,基于电流逆变器的光伏/蓄电池并联混合型分布式发电系统10,电流逆变型风力发电系统11,基于电流逆变器的光伏/蓄电池串联混合型分布式发电系统12,第一线性负载13,第一断路器14,第二断路器15,第二线性负载16。Each label in the figure:
具体实施方式 Detailed ways
为使本实用新型实现的技术手段、创作特征、达成目的与功效易于明白了解,下面结合具体实施方式,进一步阐述本实用新型。In order to make the technical means, creative features, goals and effects achieved by the utility model easy to understand, the utility model will be further elaborated below in conjunction with specific embodiments.
本实用新型提出两种具体结构:第一种是基于电流逆变器的光伏/蓄电池并联混合型分布式发电系统10,第二种是基于电流逆变器的光伏/蓄电池串联混合型分布式发电系统12。The utility model proposes two specific structures: the first is a photovoltaic/battery parallel hybrid distributed
其中,基于电流逆变器的光伏/蓄电池并联混合型分布式发电系统10包括第一电压/电流变换器5-1、蓄电池1、与蓄电池1相连接的双向功率升压直流/直流变换器2、光伏电池板3、与光伏电池板3输出端相连接的单向功率升压直流/直流变换器4和与电网7输入端相连接的电流型并网逆变器6;双向功率升压直流/直流变换器2和单向功率升压直流/直流变换器4输出端均通过第一电压/电流变换器5-1与电流型并网逆变器6输入端相连接。Among them, the photovoltaic/battery parallel hybrid distributed
该系统中,光伏系统通过单向功率升压直流/直流变换器4、蓄电池系统通过双向功率升压直流/直流变换器2在直流电压母线处并联,该直流电压母线通过一个公共的第一电压/电流变换器5-1和直流电流母线相联,该直流电流母线再通过电流型并网逆变器6接入电网7。In this system, the photovoltaic system is connected in parallel at the DC voltage bus through a unidirectional power boost DC/DC converter 4 and the battery system is connected through a bidirectional power boost DC/
参见图1,蓄电池1通过双向功率升压直流/直流变换器2和第一电压/电流变换器5-1相联,双向功率升压直流/直流变换器2用于对蓄电池1进行充放电。光伏电池板3通过单向功率升压直流/直流变换器4和第一电压/电流变换器5-1相联,用于将光伏电池板3发出的能量传送给第一电压/电流变换器5-1。单向功率升压直流/直流变换器4和双向功率升压直流/直流变换器2在输出侧并联。第一电压/电流变换器5-1将双向功率升压直流/直流变换器2和单向功率升压直流/直流变换器4的输出电压转成电流,并和电流型并网逆变器6相联。电流型并网逆变器6将直流电流转成交流并网电流,和电网7相联。Referring to FIG. 1 , a
其中,基于电流逆变器的光伏/蓄电池串联混合型分布式发电系统12包括串联的第二电压/电流变换器5-2与第三电压/电流变换器5-3、蓄电池1、与蓄电池1相连接的双向功率升压直流/直流变换器2、光伏电池板3、与光伏电池板3输出端相连接的单向功率升压直流/直流变换器4和与电网7输入端相连接的电流型并网逆变器6;双向功率升压直流/直流变换器2和单向功率升压直流/直流变换器4输出端分别通过第二电压/电流变换器5-2和第三电压/电流变换器5-3与电流型并网逆变器6输入端相连接。Among them, the photovoltaic/battery series hybrid distributed
该系统中,光伏系统和蓄电池系统分别通过独立的电压/电流变换器(第二电压/电流变换器5-2、第三电压/电流变换器5-3)和公用的电流型并网逆变器6直流电流母线相联。这样,光伏系统和蓄电池系统的电压/电流变换器将在直流电流母线处形成串联。In this system, the photovoltaic system and the storage battery system respectively pass independent voltage/current converters (second voltage/current converter 5-2, third voltage/current converter 5-3) and common current-type grid-connected inverters. The device 6 DC current bus is connected. In this way, the voltage/current converters of the photovoltaic system and the battery system will form a series connection at the DC current bus.
参见图2,蓄电池1通过双向功率升压直流/直流变换器2和第二电压/电流变换器5-2相联,双向功率升压直流/直流变换器2用于对蓄电池1进行充放电。光伏电池板3通过单向功率升压直流/直流变换器4和第三电压/电流变换器5-3相联,将光伏电池板3发出的能量传送给第三电压/电流变换器5-3。第二电压/电流变换器5-2将双向功率升压直流/直流变换器2的输出电压转成电流,第三电压/电流变换器5-3将单向功率升压直流/直流变换器4的输出电压转成电流。第二电压/电流变换器5-2的输出和第三电压/电流变换器5-3的输出串联,并和电流型并网逆变器6的直流母线相联。电流型并网逆变器6将直流电流转成交流并网电流,和电网7相联。Referring to FIG. 2 , the
基于电流逆变器的光伏/蓄电池并联混合型分布式发电系统10和基于电流逆变器的光伏/蓄电池串联混合型分布式发电系统12中,在蓄电池1、光伏电池板3、双向功率升压直流/直流变换器2和单向功率升压直流/直流变换器4的两输出端均并联有电容;电流型并网逆变器6通过电感与电网7相连接;光伏电池板3可由燃料电池取代,蓄电池1可由超级电容取代。且两种系统均可拓展为多个由光伏电池板3和单向功率升压直流/直流变换器4构成的光伏通道和多个由蓄电池1和双向功率升压直流/直流变换器2构成的蓄电池通道组成。In the current inverter-based photovoltaic/battery parallel hybrid distributed
本实用新型中提到的双向功率升压直流/直流变换器2,单向功率升压直流/直流变换器4,第一电压/电流变换器5-1,第二电压/电流变换器5-2,第三电压/电流变换器5-3和电流型并网逆变器6均为现有的器件,此处不再赘述。Bidirectional power boost DC/
参见图3,电流逆变型光伏发电系统8、基于电流逆变器的光伏/蓄电池并联混合型分布式发电系统10、电流逆变型风力发电系统11、基于电流逆变器的光伏/蓄电池串联混合型分布式发电系统12在电网7侧并联,且电网7中还联接了非线性负载9、第一线性负载13和第二线性负载16。Referring to Fig. 3, a current inverter photovoltaic power generation system 8, a photovoltaic/battery parallel hybrid distributed
当第一断路器14及第二断路器15均闭合时,图3中所有系统均并网运行。电流逆变型光伏发电系统8、基于电流逆变器的光伏/蓄电池并联混合型分布式发电系统10、电流逆变型风力发电系统11、基于电流逆变器的光伏/蓄电池串联混合型分布式发电系统12的交流侧输出有功,无功功率由各自并网逆变器控制。When both the
当将第一断路器14断开时,图3中电流逆变型光伏发电系统8、非线性负载9、基于电流逆变器的光伏/蓄电池并联混合型分布式发电系统10、电流逆变型风力发电系统11、基于电流逆变器的光伏/蓄电池串联混合型分布式发电系统12、第二线性负载16形成孤岛电网。这时,基于电流逆变器的光伏/蓄电池并联混合型分布式发电系统10和基于电流逆变器的光伏/蓄电池串联混合型分布式发电系统12将实现相应的输出电压控制,进行协调控制。由于这两种基于电流逆变器的光伏/蓄电池混合型分布式发电系统结构既可向电网中注入电能,也可从电网中吸收电能,因此可补偿孤岛电网中发电和用电负荷间的差异,可用于支撑孤岛电网的电压。When the
以上显示和描述了本实用新型的基本原理和主要特征和本实用新型的优点。本行业的技术人员应该了解,本实用新型不受上述实施例的限制,上述实施例和说明书中描述的只是说明本实用新型的原理,在不脱离本实用新型精神和范围的前提下,本实用新型还会有各种变化和改进,这些变化和改进都落入要求保护的本实用新型范围内。本实用新型要求保护范围由所附的权利要求书及其等效物界定。The basic principles and main features of the present utility model and the advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102624030A (en) * | 2012-03-29 | 2012-08-01 | 东南大学 | A photovoltaic/battery hybrid current inverter distributed power generation system |
CN103475014A (en) * | 2013-08-22 | 2013-12-25 | 国家电网公司 | Electric energy quality controller of wind driven generator based on battery energy storage and control method |
CN103683472A (en) * | 2013-12-04 | 2014-03-26 | 深圳科士达新能源有限公司 | Hybrid inverter with uninterruptible power supply function |
CN107112916A (en) * | 2014-11-24 | 2017-08-29 | Ce+T卢森堡电力公司 | DC AC power converters |
WO2017197629A1 (en) * | 2016-05-19 | 2017-11-23 | 胡炎申 | Current source inverter system and inverter device |
CN110601542A (en) * | 2019-09-11 | 2019-12-20 | 哈尔滨工程大学 | Energy storage isolation type three-port DC-DC converter of photovoltaic system and control method |
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2012
- 2012-03-29 CN CN2012201258695U patent/CN202616801U/en not_active Expired - Fee Related
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102624030A (en) * | 2012-03-29 | 2012-08-01 | 东南大学 | A photovoltaic/battery hybrid current inverter distributed power generation system |
CN103475014A (en) * | 2013-08-22 | 2013-12-25 | 国家电网公司 | Electric energy quality controller of wind driven generator based on battery energy storage and control method |
CN103475014B (en) * | 2013-08-22 | 2015-04-01 | 国家电网公司 | Electric energy quality controller of wind driven generator based on battery energy storage and control method |
CN103683472A (en) * | 2013-12-04 | 2014-03-26 | 深圳科士达新能源有限公司 | Hybrid inverter with uninterruptible power supply function |
CN107112916A (en) * | 2014-11-24 | 2017-08-29 | Ce+T卢森堡电力公司 | DC AC power converters |
WO2017197629A1 (en) * | 2016-05-19 | 2017-11-23 | 胡炎申 | Current source inverter system and inverter device |
CN110601542A (en) * | 2019-09-11 | 2019-12-20 | 哈尔滨工程大学 | Energy storage isolation type three-port DC-DC converter of photovoltaic system and control method |
CN110601542B (en) * | 2019-09-11 | 2021-03-26 | 哈尔滨工程大学 | Energy storage isolation type three-port DC-DC converter of photovoltaic system and control method |
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