CN204652311U - A kind of photovoltaic combiner box and photovoltaic system - Google Patents
A kind of photovoltaic combiner box and photovoltaic system Download PDFInfo
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Abstract
本申请公开了一种光伏汇流箱和光伏系统,该光伏汇流箱包括箱体和设置在所述箱体内的汇流电路,所述汇流电路用于将光伏阵列的N个组串汇集成一路正负输出,N>1,所述汇流电路包括2N个直流开关以及N个DC/DC电路,其中:每一个所述组串的正负极分别串联1个所述直流开关后,接入1个所述DC/DC电路的正负输入端;所述N个DC/DC电路的正负输出端并联在一起后接入直流母线,解决了光伏汇流箱需要经常更换熔丝,且光伏汇流箱或其所在的光伏系统维护工作费时费力的问题。
The present application discloses a photovoltaic combiner box and a photovoltaic system. The photovoltaic combiner box includes a box body and a confluence circuit arranged in the box. The confluence circuit is used to combine N strings of the photovoltaic array into a positive Output, N>1, the bus circuit includes 2N DC switches and N DC/DC circuits, wherein: after the positive and negative poles of each string are connected in series with one of the DC switches, one of the DC switches is connected. The positive and negative input terminals of the DC/DC circuit; the positive and negative output terminals of the N DC/DC circuits are connected in parallel and then connected to the DC bus, which solves the problem that the photovoltaic combiner box needs to replace the fuse frequently, and the photovoltaic combiner box or its The photovoltaic system maintenance work is time-consuming and labor-intensive.
Description
技术领域technical field
本实用新型涉及光伏发电技术领域,更具体地说,涉及一种光伏汇流箱和光伏系统。The utility model relates to the technical field of photovoltaic power generation, in particular to a photovoltaic combiner box and a photovoltaic system.
背景技术Background technique
光伏汇流箱是用于将光伏阵列的多个组串汇集成一路正负输出的装置。为了安全起见,现有的光伏汇流箱在每个组串的正负极上分别串联熔丝以提供反向过流保护,如图1所示,N个组串(用PV表示组串)的正负极上共串联了2N个熔丝(用FU表示熔丝)。但是,该方案存在以下弊端:A photovoltaic combiner box is a device used to combine multiple strings of a photovoltaic array into one positive and negative output. For the sake of safety, the existing photovoltaic combiner box connects fuses in series on the positive and negative poles of each string to provide reverse overcurrent protection. As shown in Figure 1, the A total of 2N fuses are connected in series on the positive and negative poles (use FU to represent the fuse). However, this scheme has the following disadvantages:
1)熔丝反向过流熔断,损坏率高,需要经常更换;1) The fuse is blown by reverse overcurrent, and the damage rate is high, so it needs to be replaced frequently;
2)在对光伏汇流箱或其所在的光伏系统进行维护时,需要拔下每个熔丝来断开所有组串输入,过后再一一安装回去,费时费力。2) When maintaining the photovoltaic combiner box or the photovoltaic system where it is located, it is necessary to unplug each fuse to disconnect all string inputs, and then install them back one by one, which is time-consuming and laborious.
实用新型内容Utility model content
有鉴于此,本实用新型提供一种光伏汇流箱和光伏系统,以解决光伏汇流箱需要经常更换熔丝,且光伏汇流箱或其所在的光伏系统维护工作费时费力的问题。In view of this, the utility model provides a photovoltaic combiner box and a photovoltaic system to solve the problem that the photovoltaic combiner box requires frequent replacement of fuses, and the maintenance of the photovoltaic combiner box or the photovoltaic system where it is located is time-consuming and laborious.
一种光伏汇流箱,包括箱体和设置在所述箱体内的汇流电路,所述汇流电路用于将光伏阵列的N个组串汇集成一路正负输出,N>1,所述汇流电路包括2N个直流开关以及N个DC/DC电路,其中:A photovoltaic combiner box, comprising a box body and a busbar circuit arranged in the box body, the busbar circuit is used to gather N strings of a photovoltaic array into one positive and negative output, N>1, and the busbar circuit includes 2N DC switches and N DC/DC circuits, of which:
每一个所述组串的正负极分别串联1个所述直流开关后,接入1个所述DC/DC电路的正负输入端;After the positive and negative poles of each of the strings are connected in series with one of the DC switches, they are connected to the positive and negative input ends of one of the DC/DC circuits;
所述N个DC/DC电路的正负输出端并联在一起后接入直流母线。The positive and negative output terminals of the N DC/DC circuits are connected in parallel and then connected to the DC bus.
可选地,所述汇流电路还包括断路开关,其中,所述N个DC/DC电路的正负输出端并联在一起后再经所述断路开关接入直流母线。Optionally, the bus circuit further includes a disconnect switch, wherein the positive and negative output terminals of the N DC/DC circuits are connected in parallel and then connected to the DC bus through the disconnect switch.
其中,所述多个DC/DC电路均为Boost电路或者均为反激式电路。Wherein, the plurality of DC/DC circuits are Boost circuits or flyback circuits.
其中,所述2N个直流开关均为手动开关。Wherein, the 2N DC switches are all manual switches.
其中,所述2N个直流开关均为电子控制开关。Wherein, the 2N DC switches are electronically controlled switches.
可选地,所述光伏汇流箱还包括:设置在所述箱体内、与所述2N个直流开关和所述N个DC/DC电路相连的控制器。Optionally, the photovoltaic combiner box further includes: a controller disposed in the box and connected to the 2N DC switches and the N DC/DC circuits.
其中,所述控制器具有对外通信接口。Wherein, the controller has an external communication interface.
其中,所述外通信接口为有线通信接口或者无线通信接口。Wherein, the external communication interface is a wired communication interface or a wireless communication interface.
可选地,所述光伏汇流箱还包括:设置在所述箱体内、与所述控制器相连的本地操作单元。Optionally, the photovoltaic combiner box further includes: a local operation unit arranged in the box and connected to the controller.
一种光伏系统,包括上述任一种光伏汇流箱。A photovoltaic system, including any photovoltaic combiner box mentioned above.
从上述的技术方案可以看出,本实用新型用直流开关代替熔丝,在需要对光伏汇流箱及其所在的光伏系统进行维护时通过断开每个直流开关来切断所有组串与汇流电路之间的电气连接,在需要恢复工作时就直接闭合每个直流开关来接通所有组串与汇流电路之间的电气连接,期间不涉及直流开关反复拔下再安装的过程,方便了光伏系统的维护。并且,本实用新型用DC/DC电路作为防逆流装置,不会出现反向过流现象,因此无需再借助熔丝实现反向过流保护,解决了光伏汇流箱需要经常更换熔丝的问题。此外,所述DC/DC电路还可以通过对光伏能量进行最大功率点跟踪来实现对光伏阵列的功率优化。It can be seen from the above technical scheme that the utility model uses a DC switch instead of a fuse, and cuts off the connection between all strings and the bus circuit by disconnecting each DC switch when it is necessary to maintain the photovoltaic combiner box and the photovoltaic system where it is located. When it is necessary to resume work, each DC switch is directly closed to connect all the electrical connections between the strings and the bus circuit. During this period, the process of repeatedly unplugging and reinstalling the DC switch is not involved, which facilitates the photovoltaic system. maintain. Moreover, the utility model uses a DC/DC circuit as an anti-backflow device, and there will be no reverse overcurrent phenomenon, so there is no need to use a fuse to achieve reverse overcurrent protection, which solves the problem that the photovoltaic combiner box needs to frequently replace the fuse. In addition, the DC/DC circuit can also realize the power optimization of the photovoltaic array by performing maximum power point tracking on the photovoltaic energy.
附图说明Description of drawings
为了更清楚地说明本实用新型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实用新型的一些实施例,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 accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.
图1为现有技术公开的一种光伏汇流箱结构示意图;Fig. 1 is a structural schematic diagram of a photovoltaic combiner box disclosed in the prior art;
图2为本实用新型实施例公开的一种光伏汇流箱结构示意图;Fig. 2 is a schematic structural diagram of a photovoltaic combiner box disclosed in an embodiment of the present invention;
图3为本实用新型实施例公开的又一种光伏汇流箱结构示意图;Fig. 3 is a structural schematic diagram of another photovoltaic combiner box disclosed in the embodiment of the present invention;
图4为本实用新型实施例公开的又一种光伏汇流箱结构示意图。Fig. 4 is a structural schematic diagram of another photovoltaic combiner box disclosed in the embodiment of the present invention.
具体实施方式Detailed ways
下面将结合本实用新型实施例中的附图,对本实用新型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实用新型一部分实施例,而不是全部的实施例。基于本实用新型中的实施例,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,都属于本实用新型保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.
参见图2,本实用新型实施例公开了一种光伏汇流箱,以解决光伏汇流箱需要经常更换熔丝,且光伏汇流箱或其所在的光伏系统维护工作费时费力的问题,它包括箱体和设置在所述箱体内的汇流电路;所述汇流电路用于将光伏阵列的N个组串汇集成一路正负输出,其组成部件至少包括2N个直流开关(用S表示直流开关)以及N个DC/DC电路,其中:Referring to Fig. 2, the embodiment of the utility model discloses a photovoltaic combiner box to solve the problem that the photovoltaic combiner box needs to replace the fuse frequently, and the maintenance of the photovoltaic combiner box or the photovoltaic system where it is located is time-consuming and laborious. It includes a box body and A confluence circuit arranged in the box; the confluence circuit is used to integrate the N strings of the photovoltaic array into one positive and negative output, and its components include at least 2N DC switches (use S to represent DC switches) and N DC/DC circuits, where:
每一个所述组串的正负极分别串联1个所述直流开关后,接入1个所述DC/DC电路的正负输入端;After the positive and negative poles of each of the strings are connected in series with one of the DC switches, they are connected to the positive and negative input ends of one of the DC/DC circuits;
所述N个DC/DC电路的正负输出端并联在一起后接入直流母线(用BUS表示直流母线)。The positive and negative output ends of the N DC/DC circuits are connected in parallel and then connected to the DC bus (BUS is used to represent the DC bus).
直流开关可以根据外界施加的控制信号和要求,手动或自动地分断或接通直流电路。基于此,本实施例用直流开关代替熔丝,在需要对光伏汇流箱或其所在的光伏系统进行维护时通过断开每个直流开关来切断所有组串与汇流电路之间的电气连接,在需要恢复光伏汇流箱或其所在的光伏系统工作时就直接闭合每个直流开关来接通所有组串与汇流电路之间的电气连接。相较于熔丝,使用直流开关来断开或接通组串输入的过程中不涉及直流开关反复拔下再安装的过程,因此方便了光伏汇流箱或其所在的光伏系统的维护。The DC switch can manually or automatically break or connect the DC circuit according to the control signal and requirements imposed by the outside world. Based on this, in this embodiment, a DC switch is used instead of a fuse, and when the photovoltaic combiner box or the photovoltaic system where it is located needs to be maintained, each DC switch is disconnected to cut off the electrical connection between all strings and the bus circuit. When it is necessary to restore the photovoltaic combiner box or the photovoltaic system where it is located, each DC switch is directly closed to connect all the electrical connections between the strings and the bus circuit. Compared with the fuse, the process of using the DC switch to disconnect or connect the string input does not involve the process of repeatedly unplugging and reinstalling the DC switch, so it is convenient for the maintenance of the photovoltaic combiner box or the photovoltaic system where it is located.
本实施例中,所述2N个直流开关可以采用手动开关,如闸刀式开关等;也可以采用电子控制开关,如继电器、电动操作开关等。In this embodiment, the 2N DC switches may be manual switches, such as knife switches, or electronically controlled switches, such as relays and electric operation switches.
DC/DC电路为单向电路,可以防止电流从直流母线侧反向流入光伏侧,不会出现反向过流现象,因此无需使用熔丝来提供反向过流保护。此外,所述DC/DC电路还可以通过对光伏能量进行最大功率点跟踪来实现对光伏阵列的功率优化,使得光伏汇流箱不再只是单纯对各个组串起汇流作用,还可以起到功率优化作用。The DC/DC circuit is a unidirectional circuit, which can prevent the current from flowing into the photovoltaic side from the DC bus side in reverse, and there will be no reverse overcurrent phenomenon, so there is no need to use a fuse to provide reverse overcurrent protection. In addition, the DC/DC circuit can also realize the power optimization of the photovoltaic array by tracking the maximum power point of the photovoltaic energy, so that the photovoltaic combiner box is no longer just a confluence function for each string, but also a power optimization effect.
本实施例中,所述N个DC/DC电路可以采用Boost电路,也可以采用反激式电路,并不局限。In this embodiment, the N DC/DC circuits may use a Boost circuit or a flyback circuit, which is not limited thereto.
此外,参见图3,基于上述实施例,本实用新型公开了又一种光伏汇流箱,该光伏汇流箱中的汇流电路还包括:断路开关,其中,所述N个DC/DC电路的正负输出端并联在一起后再经所述断路开关接入直流母线。所述断路开关用于在需要对光伏汇流箱或其所在的光伏系统进行维护时断开汇流电路与后级电路之间的电气连接。In addition, referring to FIG. 3 , based on the above-mentioned embodiments, the utility model discloses yet another photovoltaic combiner box. The combiner circuit in the photovoltaic combiner box further includes: a circuit breaker, wherein the positive and negative terminals of the N DC/DC circuits The output terminals are connected in parallel and then connected to the DC bus through the circuit breaker. The disconnect switch is used to disconnect the electrical connection between the bus circuit and the subsequent circuit when the photovoltaic combiner box or the photovoltaic system where it is located needs to be maintained.
此外,在所述2N个直流开关均为电子控制开关的情况下,基于上述任一实施例,本实用新型公开了又一种光伏汇流箱,参见图4,该光伏汇流箱还包括:设置在光伏汇流箱的箱体内的控制器,所述控制器与所述2N个直流开关和所述N个DC/DC电路相连,用于判断光伏系统故障、控制所述N个DC/DC电路的运行以及控制所述2N个直流开关的通断等。In addition, in the case that the 2N DC switches are all electronically controlled switches, based on any of the above-mentioned embodiments, the utility model discloses another photovoltaic combiner box, as shown in Fig. 4 , the photovoltaic combiner box further includes: A controller in the box of the photovoltaic combiner box, the controller is connected to the 2N DC switches and the N DC/DC circuits, and is used to judge the failure of the photovoltaic system and control the operation of the N DC/DC circuits And controlling the on-off of the 2N DC switches, etc.
可选地,所述控制器还具有对外通信接口,用于对外发送光伏汇流箱的运行状态或者接受外部控制指令等。所述通信接口可以是有线通信接口,也可以是无线通信接口。Optionally, the controller also has an external communication interface for sending the operating status of the photovoltaic combiner box to the outside or accepting external control instructions. The communication interface may be a wired communication interface or a wireless communication interface.
可选地,所述光伏汇流箱还具有设置在箱体内的、与所述控制器相连的本地操作单元。所述本地操作单元可以包括输入设备和输出设备,其中:所述输出设备用于显示汇流电路当前的状态,如所述2N个直流开关的通断状态、所述N个DC/DC电路的运行停止状态、N个组串的电参数信息等,作为典型的实现方式,所述输出设备可以是指示灯、数码管或者液晶屏等;所述输入设备用于输入控制所述N个DC/DC电路运行的命令、控制所述2N个直流开关通断的命令等,作为典型的实现方式,所述输入设备可以是操作键盘。或者,所述本地操作单元也可以采用集输入输出功能于一体的触摸屏。Optionally, the photovoltaic combiner box also has a local operating unit disposed in the box and connected to the controller. The local operation unit may include an input device and an output device, wherein: the output device is used to display the current state of the bus circuit, such as the on-off state of the 2N DC switches, the operation of the N DC/DC circuits Stop state, electrical parameter information of N strings, etc., as a typical implementation, the output device can be an indicator light, a digital tube or a liquid crystal screen, etc.; the input device is used to input and control the N DC/DC Commands for circuit operation, commands for controlling the on-off of the 2N DC switches, etc., as a typical implementation manner, the input device may be an operating keyboard. Alternatively, the local operation unit may also adopt a touch screen integrating input and output functions.
综上所述,本实用新型用直流开关代替熔丝,在需要对光伏汇流箱及其所在的光伏系统进行维护时通过断开每个直流开关来切断所有组串与汇流电路之间的电气连接,在需要恢复工作时就直接闭合每个直流开关来接通所有组串与汇流电路之间的电气连接,期间不涉及直流开关反复拔下再安装的过程,方便了光伏系统的维护。并且,本实用新型用DC/DC电路作为防逆流装置,不会出现反向过流现象,因此无需再借助熔丝实现反向过流保护,解决了光伏汇流箱需要经常更换熔丝的问题。此外,所述DC/DC电路还可以通过对光伏能量进行最大功率点跟踪来实现对光伏阵列的功率优化。To sum up, the utility model replaces the fuse with a DC switch, and cuts off the electrical connection between all strings and the bus circuit by disconnecting each DC switch when it is necessary to maintain the photovoltaic combiner box and the photovoltaic system where it is located. When it is necessary to resume work, each DC switch is directly closed to connect all the electrical connections between the strings and the bus circuit. During this period, the process of repeatedly unplugging and reinstalling the DC switch is not involved, which facilitates the maintenance of the photovoltaic system. Moreover, the utility model uses a DC/DC circuit as an anti-backflow device, and there will be no reverse overcurrent phenomenon, so there is no need to use a fuse to achieve reverse overcurrent protection, which solves the problem that the photovoltaic combiner box needs to frequently replace the fuse. In addition, the DC/DC circuit can also realize the power optimization of the photovoltaic array by performing maximum power point tracking on the photovoltaic energy.
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。Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.
对所公开的实施例的上述说明,使本领域专业技术人员能够实现或使用本实用新型。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的,本文中所定义的一般原理可以在不脱离本实用新型的精神或范围的情况下,在其它实施例中实现。因此,本实用新型将不会被限制于本文所示的这些实施例,而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. Various modifications to these embodiments will be readily apparent 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 will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110896227A (en) * | 2018-09-12 | 2020-03-20 | 阳光电源股份有限公司 | Photovoltaic power generation system and photovoltaic inverter |
CN113508506A (en) * | 2020-12-31 | 2021-10-15 | 华为技术有限公司 | Photovoltaic power generation system, photovoltaic inverter and direct current collection flow box |
US12095256B2 (en) | 2019-08-01 | 2024-09-17 | Huawei Digital Power Technologies Co., Ltd. | Fault isolation apparatus, direct current boost apparatus, and inverter apparatus |
-
2015
- 2015-06-18 CN CN201520424370.8U patent/CN204652311U/en not_active Expired - Lifetime
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110896227A (en) * | 2018-09-12 | 2020-03-20 | 阳光电源股份有限公司 | Photovoltaic power generation system and photovoltaic inverter |
CN110896227B (en) * | 2018-09-12 | 2021-11-02 | 阳光电源股份有限公司 | Photovoltaic power generation system and photovoltaic inverter |
US12095256B2 (en) | 2019-08-01 | 2024-09-17 | Huawei Digital Power Technologies Co., Ltd. | Fault isolation apparatus, direct current boost apparatus, and inverter apparatus |
CN113508506A (en) * | 2020-12-31 | 2021-10-15 | 华为技术有限公司 | Photovoltaic power generation system, photovoltaic inverter and direct current collection flow box |
WO2022141526A1 (en) * | 2020-12-31 | 2022-07-07 | 华为数字能源技术有限公司 | Photovoltaic power generation system, photovoltaic inverter and direct-current combiner box |
US12003096B2 (en) | 2020-12-31 | 2024-06-04 | Huawei Digital Power Technologies Co., Ltd. | Photovoltaic power generation system, photovoltaic inverter, and direct current combiner box |
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