CN101409449B - Circuit structure of a photovoltaic power generation system - Google Patents
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Abstract
本发明公开了一种光伏发电系统的电路结构,第一个直流功率单元的负输出端与相邻直流功率单元的正输出端连接,第一个直流功率单元的正输出端与交流功率单元公共直流母线的正输入电压端相连接,最后一个直流功率单元的负输出端与交流功率单元公共直流母线的负输入电压端相连接,所有并联的交流功率单元的负输出端与交流功率单元公共直流母线的负输入电压端相连接,所有并联的交流功率单元的正输出端与交流功率单元公共直流母线的正输入电压端相连接。采用这样的结构,解决了现有光伏发电系统在解决受阴影影响支路的最大功率点跟踪问题的同时而带来的新的其他问题。
The invention discloses a circuit structure of a photovoltaic power generation system. The negative output terminal of the first DC power unit is connected to the positive output terminal of the adjacent DC power unit, and the positive output terminal of the first DC power unit is shared with the AC power unit. The positive input voltage terminal of the DC bus is connected, the negative output terminal of the last DC power unit is connected to the negative input voltage terminal of the common DC bus of the AC power units, and the negative output terminals of all parallel AC power units are connected to the common DC of the AC power unit. The negative input voltage terminals of the busbars are connected, and the positive output terminals of all parallel-connected AC power units are connected with the positive input voltage terminals of the common DC busbar of the AC power units. Adopting such a structure solves other new problems caused by existing photovoltaic power generation systems while solving the maximum power point tracking problem of branches affected by shadows.
Description
技术领域technical field
本发明属于太阳能发电技术领域,具体涉及一种光伏发电系统的电路结构。The invention belongs to the technical field of solar power generation, and in particular relates to a circuit structure of a photovoltaic power generation system.
背景技术Background technique
随着全球气候变暖,以及自然能源的不断消耗,世界面临着前所未有的能源危机与挑战,因此太阳能等可再生新能源日益受到人们的重视。对于大规模光伏发电系统而言,考虑硬件成本的因素,集中式光伏发电系统占有非常大的优势。但是,由于光伏阵列是直接进行串并联连接,云朵、高大建筑物等引起的部分阴影问题,会导致光伏阵列的整体输出功率下降,同时受阴影影响的光伏电池也会出现热斑问题,因此如何克服部分阴影问题成为人们研究的热点之一。With global warming and the continuous consumption of natural energy, the world is facing unprecedented energy crisis and challenges. Therefore, renewable new energy such as solar energy has been paid more and more attention by people. For large-scale photovoltaic power generation systems, the centralized photovoltaic power generation system has a very large advantage considering the hardware cost. However, since the photovoltaic array is directly connected in series and parallel, the partial shadow caused by clouds and tall buildings will cause the overall output power of the photovoltaic array to drop, and the photovoltaic cells affected by the shadow will also have hot spots. Overcoming the partial shadow problem has become one of the hotspots of people's research.
文献[1]提出了直接由光伏电池板串联组成的支路式结构,文献[2]提出多支路式结构,两者只能解决没有阴影影响支路的最大功率点跟踪问题,而不能解决受阴影影响支路的最大功率点跟踪问题。文献[3]提出了AC Module的电路思想,可以从根本上解决阴影问题,但是由于每个光伏电池板都带有一个独立的功率逆变装置,每个功率逆变装置必须实时工作,因此对于大功率系统而言,不仅成本非常高,而且整体效率也不高。文献[4]提出DC Module电路,每个光伏电池板拥有一个独立的DC/DC变换器,然后多个DC Module电路串联,共用一个逆变装置。该电路也可以解决部分阴影问题,但是每个DC Module电路也是实时工作的,电路自身必然存在功率损失,因此,降低了整个系统的效率,同时DC Module电路若出现故障,则该光伏电池板不能正常工作,可能导致整个系统性能下降。文献[5]在支路式电路结构基础上,提出了旁路DC/DC模块集成变换器结构,只有在出现阴影时对应的旁路DC/DC变换电路才开始工作,这可以解决文献[4]中DC Module电路自身实时工作引起的功率损失,但是由于旁路DC/DC变换电路之间互相影响,因此,最大功率点跟踪速度较慢,控制算法也较复杂,该电路同样存在故障后影响整个系统性能问题。Literature [1] proposed a branch structure directly composed of photovoltaic panels in series, and literature [2] proposed a multi-branch structure. Both of them can only solve the problem of maximum power point tracking without shadow affecting branches, but cannot solve The maximum power point tracking problem for branches affected by shadows. Literature [3] proposed the circuit idea of AC Module, which can fundamentally solve the shadow problem, but since each photovoltaic panel has an independent power inverter, each power inverter must work in real time, so for For high power systems, not only the cost is very high, but the overall efficiency is not high. Literature [4] proposes a DC Module circuit, each photovoltaic panel has an independent DC/DC converter, and then multiple DC Module circuits are connected in series to share an inverter device. This circuit can also solve the problem of partial shading, but each DC Module circuit also works in real time, and the circuit itself must have power loss, so the efficiency of the entire system is reduced. At the same time, if the DC Module circuit fails, the photovoltaic panel cannot work properly, may cause overall system performance to degrade. Literature [5] proposes a bypass DC/DC module integrated converter structure based on the branch circuit structure. Only when the shadow appears, the corresponding bypass DC/DC conversion circuit starts to work, which can solve the problem of literature [4]. In ], the power loss caused by the real-time operation of the DC Module circuit itself, but due to the mutual influence between the bypass DC/DC conversion circuits, the maximum power point tracking speed is relatively slow, and the control algorithm is also relatively complicated, and the circuit also has post-fault effects Overall system performance issues.
对于逆变电路装置而言,通常针对光伏阵列的最大功率进行设计。若光伏阵列输出功率很大时,采用单个逆变电路装置实现,则主电路功率元件的额定容量必然很大。但是,光照强度变弱时,光伏阵列本身输出功率不大,这就引起整体效率低下。同时,从安全可靠性的角度考虑,单个逆变电路装置一旦发生故障,整个光伏发电系统必须停止运行,这对重要场合是非常危险的。文献[6]提出了基于逆变功率单元的主从式电路结构,由一个主逆变功率单元根据实际功率大小控制其它从逆变功率单元是否投入工作,这可以解决整体效率与安全可靠性的统一。但是由于主逆变功率单元总是投入工作,因此存在主逆变功率单元寿命比其它从逆变功率单元短的问题。For the inverter circuit device, it is usually designed for the maximum power of the photovoltaic array. If the output power of the photovoltaic array is very large, a single inverter circuit device is used to realize it, and the rated capacity of the power components of the main circuit must be very large. However, when the light intensity becomes weak, the output power of the photovoltaic array itself is not large, which causes the overall efficiency to be low. At the same time, from the perspective of safety and reliability, once a single inverter circuit device fails, the entire photovoltaic power generation system must stop running, which is very dangerous for important occasions. Literature [6] proposes a master-slave circuit structure based on inverter power units. One master inverter power unit controls whether other slave inverter power units are put into operation according to the actual power, which can solve the problem of overall efficiency and safety reliability. Unite. However, since the master inverter power unit is always put into operation, there is a problem that the service life of the master inverter power unit is shorter than that of other slave inverter power units.
文献[1]B.Verhoeven et al.,Utility aspects of grid connected photovoltaicpower systems(1998).International energy agency photovoltaic power systems,IEA PVPS T5-01:1998.[online].Available:www.iea-pvps.org.Literature [1] B.Verhoeven et al., Utility aspects of grid connected photovoltaic power systems (1998). International energy agency photovoltaic power systems, IEA PVPS T5-01:1998. [online]. Available: www.iea-pvps.org .
文献[2]M.Meinhardt and G.Cramer,“Past,present and future of gridconnected photovoltaic-and hybrid-power-systems,”in Proc.IEEE-PES Summermeeting,vol.2,2000,pp.1283-1288.Literature [2] M.Meinhardt and G.Cramer, "Past, present and future of gridconnected photovoltaic-and hybrid-power-systems," in Proc.IEEE-PES Summermeeting, vol.2, 2000, pp.1283-1288.
文献[3]Gross M.A.,Martin S.O.,Pearsall N.M.,“Estimation of outputenhancement of a partially shaded BIPV array by the use of AC modules,”Photovoltaic Specialists Conference,Conference Record of the Twenty-sixthIEEE,pp.1381-1384,29 Sept.-3 Oct.1997.Literature [3] Gross M.A., Martin S.O., Pearsall N.M., "Estimation of outputenhancement of a partially shaded BIPV array by the use of AC modules," Photovoltaic Specialists Conference, Conference Record of the Twenty-sixth IEEE, pp.13481, 2-1 Sept.-3 Oct.1997.
文献[4]G.R.Walker and P.C.Sernia,“Cascaded DC-DC converterconnection of photovoltaic modules,”IEEE Transactions on Power Electronics,vol.19,no.4,pp.1130-1139,July 2004.Literature [4] G.R.Walker and P.C.Sernia, "Cascaded DC-DC converterconnection of photovoltaic modules," IEEE Transactions on Power Electronics, vol.19, no.4, pp.1130-1139, July 2004.
文献[5]G.R.Walker,J.K.Xue and P.C.Sernia,“PV string per-modulemaximum power point enabling converters,”A ustralasian Universties PowerEngineering Conference (AUPEC’03),vol.1,University of Canterbury,Christchurch,New Zealand,pp.1-6,available:www.itee.uq.edu.au/~aupec/.Literature [5] G.R.Walker, J.K.Xue and P.C.Sernia, "PV string per-modulemaximum power point enabling converters," Australasian Universities PowerEngineering Conference (AUPEC'03), vol.1, University of Canterbury, Christchurch, New Zealand, pp .1-6, available: www.itee.uq.edu.au/~aupec/.
文献[6]M.Meinhardt,G.Cramer,F.Greizer,Technische innovationenimbooomenden markt der PV Systemtechnik,18 Symposium PhotovoltaischeSonnenenergie,Staffelstein,Germany,2003.Literature [6] M. Meinhardt, G. Cramer, F. Greizer, Technische innovationenimboomenden markt der PV Systemtechnik, 18 Symposium Photovoltaische Sonnenenergie, Staffelstein, Germany, 2003.
发明内容Contents of the invention
本发明的目的是提供一种光伏发电系统的电路结构,不仅解决了受阴影影响的最大功率点跟踪问题,而且也解决了现有光伏发电系统在处理部分阴影问题时而又引出的其他问题,降低了通常DC/DC变换电路一直工作而导致的功率损失,使DC/DC变换电路之间互相无影响,提高了系统的性能以及安全可靠性,降低了硬件的成本,并且提高了系统的效率。The purpose of the present invention is to provide a circuit structure of a photovoltaic power generation system, which not only solves the problem of maximum power point tracking affected by shadows, but also solves other problems caused by existing photovoltaic power generation systems when dealing with partial shadows, reducing It eliminates the power loss caused by the usual DC/DC conversion circuit working all the time, makes the DC/DC conversion circuits independent of each other, improves the performance and safety reliability of the system, reduces the cost of hardware, and improves the efficiency of the system.
本发明所采用的技术方案是,一种光伏发电系统的电路结构,包括至少两个相串联的直流功率单元和至少两个相并联的交流功率单元,所有的直流功率单元通过公共的串行通信总线与串行通信网络相连接,所有的交流功率单元通过公共的串行通信总线与串行通信网络相连接,第一个直流功率单元的负输出端与相邻直流功率单元的正输出端连接,第一个直流功率单元的正输出端与交流功率单元公共直流母线的正输入电压端相连接,最后一个直流功率单元的负输出端与交流功率单元公共直流母线的负输入电压端相连接,所有并联的交流功率单元的负输出端与交流功率单元公共直流母线的负输入电压端相连接,所有并联的交流功率单元的正输出端与交流功率单元公共直流母线的正输入电压端相连接。The technical solution adopted in the present invention is a circuit structure of a photovoltaic power generation system, including at least two DC power units connected in series and at least two AC power units connected in parallel, and all DC power units communicate through a common serial The bus is connected to the serial communication network, all AC power units are connected to the serial communication network through a common serial communication bus, and the negative output terminal of the first DC power unit is connected to the positive output terminal of the adjacent DC power unit , the positive output terminal of the first DC power unit is connected to the positive input voltage terminal of the common DC bus of the AC power unit, the negative output terminal of the last DC power unit is connected to the negative input voltage terminal of the common DC bus of the AC power unit, The negative output terminals of all the parallel connected AC power units are connected to the negative input voltage terminals of the common DC bus of the AC power units, and the positive output terminals of all the parallel connected AC power units are connected to the positive input voltage terminals of the common DC bus of the AC power units.
本发明的特征还在于:The present invention is also characterized in that:
直流功率单元的结构为:至少两个光伏电池板并联,再与一个DC/DC变换电路并联,光伏电池板的正电压输出端与DC/DC变换电路的正电压输出端之间连接有一个防止反向充电的功率二极管,光伏电池板的负电压输出端与DC/DC变换电路的负电压输出端连接,光伏电池板的负电压输出端与DC/DC变换电路的负电压输出端为相同电位。The structure of the DC power unit is: at least two photovoltaic panels are connected in parallel, and then connected in parallel with a DC/DC conversion circuit. Reverse charging power diode, the negative voltage output terminal of the photovoltaic cell panel is connected to the negative voltage output terminal of the DC/DC conversion circuit, and the negative voltage output terminal of the photovoltaic cell panel is at the same potential as the negative voltage output terminal of the DC/DC conversion circuit .
交流功率单元由单相或三相逆变电路组成。The AC power unit consists of a single-phase or three-phase inverter circuit.
本发明的有益效果是,The beneficial effect of the present invention is,
将若干个光伏电池板并联,再与一个DC/DC变换电路并联,然后在光伏电池板正电压输出端与DC/DC变换电路的正电压输出端之间连接一个防止反向充电的功率二极管,构成了一个直流功率单元。然后将若干个直流功率单元进行串联连接,再与若干个并联的交流功率单元连接。采用这样的结构,解决了现有光伏发电系统在解决受阴影影响支路的最大功率点跟踪问题的同时而带来的新的其他问题,降低了通常DC/DC变换电路一直工作而导致的功率损失,使DC/DC变换电路之间互相无影响,提高了系统的性能以及安全可靠性,降低了硬件的成本,并且提高了系统的效率。Connect several photovoltaic panels in parallel, and then connect them in parallel with a DC/DC conversion circuit, and then connect a power diode to prevent reverse charging between the positive voltage output terminal of the photovoltaic panel and the positive voltage output terminal of the DC/DC conversion circuit, constitutes a DC power unit. Then several DC power units are connected in series, and then connected with several parallel AC power units. Adopting such a structure solves other new problems caused by the existing photovoltaic power generation system while solving the maximum power point tracking problem of the branch affected by the shadow, and reduces the power caused by the usual DC/DC conversion circuit working all the time. Loss, so that the DC/DC conversion circuits do not affect each other, improve the performance and safety reliability of the system, reduce the cost of hardware, and improve the efficiency of the system.
附图说明Description of drawings
图1是本发明电路结构示意图;Fig. 1 is a schematic diagram of the circuit structure of the present invention;
图2是本发明电路结构中直流功率单元结构示意图;Fig. 2 is a schematic diagram of the DC power unit structure in the circuit structure of the present invention;
图3是本发明电路结构中交流功率单元结构示意图。Fig. 3 is a schematic diagram of the structure of the AC power unit in the circuit structure of the present invention.
图中,1.功率二极管,2.光伏电池板,3.DC/DC变换电路,4.交流功率单元,5.直流功率单元,6.串行通信网络。In the figure, 1. Power diode, 2. Photovoltaic panel, 3. DC/DC conversion circuit, 4. AC power unit, 5. DC power unit, 6. Serial communication network.
具体实施方式Detailed ways
下面结合附图和具体实施方式对本发明进行详细说明。The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
图1是本发明一种实施例的电路结构示意图,一个直流功率单元5的负输出端与相邻直流功率单元5的正输出端相连,依次类推,使k个直流功率单元5串联。由第一个直流功率单元5的正输出端连接交流功率单元4的公共直流母线的正输入电压端,第k个直流功率单元5的负输出端连接交流功率单元4的公共直流母线的负输入电压端。m个交流功率单元4的负输出端并联连接至公共直流母线的负输入电压端,m个交流功率单元4的正输出端并联连接至公共直流母线的正输入电压端。FIG. 1 is a schematic diagram of a circuit structure of an embodiment of the present invention. The negative output terminal of a DC power unit 5 is connected to the positive output terminal of an adjacent DC power unit 5, and so on, so that k DC power units 5 are connected in series. The positive output terminal of the first DC power unit 5 is connected to the positive input voltage terminal of the common DC bus of the AC power unit 4, and the negative output terminal of the kth DC power unit 5 is connected to the negative input of the common DC bus of the AC power unit 4 voltage terminal. The negative output terminals of the m AC power units 4 are connected in parallel to the negative input voltage terminal of the common DC bus, and the positive output terminals of the m AC power units 4 are connected in parallel to the positive input voltage terminal of the common DC bus.
所有直流功率单元5和交流功率单元4都具有串行通信接口电路,利用公共的串行通信总线把上述单元都连接起来,本发明的电路结构通过串行通信网络6对所有直流功率单元5和交流功率单元4中的功率信息进行交换。All DC power units 5 and AC power units 4 have serial communication interface circuits, and the above-mentioned units are connected by a common serial communication bus. The circuit structure of the present invention communicates all DC power units 5 and 4 through a serial communication network 6. The power information in the AC power unit 4 is exchanged.
把k个直流功率单元5串联后的输出电压作为m个交流功率单元4的公共直流母线电压,使k个直流功率单元5串联后的输出电压达到较高的直流电压等级,以满足逆变电压要求。除一个交流功率单元4作为主控制单元外,其余所有的直流功率单元5和交流功率单元4都作为从控制单元。由主控制单元搜集输出功率等信息,指挥从控制单元是否投入工作。每个直流功率单元5和交流功率单元4都具有最大功率点跟踪功能,可以解决部分阴影问题。所有的交流功率单元4作为交流逆变单元构成了逆变装置。根据所有直流功率单元5的输出功率以及每个交流功率单元4的运行时间,通过串行网络控制技术控制交流功率单元4运行与停止。串行网络控制技术可以解决所有的交流功率单元4和直流功率单元5之间的协调工作问题,同时提高了交流逆变单元的平均使用寿命。The output voltage of k DC power units 5 in series is used as the common DC bus voltage of m AC power units 4, so that the output voltage of k DC power units 5 in series reaches a higher DC voltage level to meet the requirements of the inverter voltage Require. Except for one AC power unit 4 as the master control unit, all other DC power units 5 and AC power units 4 are slave control units. The main control unit collects information such as output power, and directs whether the slave control unit is put into work. Each DC power unit 5 and AC power unit 4 has a maximum power point tracking function, which can solve the partial shadow problem. All the AC power units 4 constitute an inverter device as AC inverter units. According to the output power of all the DC power units 5 and the running time of each AC power unit 4, the operation and stop of the AC power units 4 are controlled through the serial network control technology. The serial network control technology can solve the problem of coordination between all the AC power units 4 and the DC power units 5, and at the same time increase the average service life of the AC inverter units.
直流功率单元5的结构如图2所示,将N个光伏电池板2并联,再与一个DC/DC变换电路3并联,光伏电池板2的正电压输出端与DC/DC变换电路3的正电压输出端之间连接有一个防止反向充电的功率二极管1,光伏电池板2的负电压输出端与DC/DC变换电路3的负电压输出端连接,光伏电池板2的负电压输出端与DC/DC变换电路3的负电压输出端为相同电位。The structure of the DC power unit 5 is shown in Figure 2. N photovoltaic cell panels 2 are connected in parallel, and then connected in parallel with a DC/
在光照强度相同时,所有光伏电池板2通过防止反向充电的功率二极管1输出相同的功率,此时因为所有DC/DC变换电路3不工作,所以所有直流功率单元5没有功率损失。当部分阴影出现时,受到影响的光伏电池板2对应的DC/DC变换电路3才工作,跟踪最大功率点,防止反向充电的功率二极管1由于反压作用而自动停止电流流动。没有阴影影响的直流功率单元5照常通过防止反向充电的功率二极管1输出功率。当部分阴影不存在时,当初工作的DC/DC变换电路3停止工作,继续通过对应的防止反向充电的功率二极管1输出功率。这样就可以解决通常DC/DC变换电路3一直工作而导致的自身电路损耗问题,同时也可以避免由于DC/DC变换电路出现故障而导致的直流功率单元不能工作的问题,提高了系统的安全可靠性。When the light intensity is the same, all photovoltaic panels 2 output the same power through the power diode 1 that prevents reverse charging. At this time, because all DC/
交流功率单元4由单相或三相逆变电路组成,如图3所示,交流功率单元4输出端连接电网或交流负载,输入端分别接公共直流母线的正输入电压端和公共直流母线的负输入电压端。既可以用于并网运行,也可以离网独立运行。The AC power unit 4 is composed of a single-phase or three-phase inverter circuit, as shown in Figure 3, the output end of the AC power unit 4 is connected to the power grid or an AC load, and the input end is respectively connected to the positive input voltage end of the common DC bus and the positive input voltage end of the common DC bus. Negative input voltage terminal. It can be used for both grid-connected operation and off-grid independent operation.
由于相同型号的光伏电池板2具有相同的伏安特性,同时光伏电池板2并联时,即使其中部分电池板受到阴影影响,根据光伏电池板2端电压相同时并联的总功率近似等于每个并联光伏电池板2最大功率之和的原理,只要DC/DC变换电路3实现最大功率点跟踪,则所有并联连接的光伏电池板2都近似处于最大功率点。因此,光伏电池板2的接法是先把N个光伏电池板2并联,然后再与一个DC/DC变换电路3并联,从而组成直流功率单元5。k个直流功率单元5串联构成整个系统的输入直流母线。采用这样的连接方法可以大大减少DC/DC变换电路3的数量,既可以解决硬件成本的问题,也可以解决部分阴影的问题。Since photovoltaic panels 2 of the same type have the same volt-ampere characteristics, and when photovoltaic panels 2 are connected in parallel, even if some of the panels are affected by shadows, the total power of the parallel connection is approximately equal to each The principle of the sum of the maximum power of the photovoltaic panels 2 is that as long as the DC/
在启动阶段,所有直流功率单元5都不工作,所有交流功率单元4都投入运行。等待几分钟后,系统进入正常工作阶段。此时主控制单元根据各个直流功率单元5的输出功率判定阴影是否存在。判定依据是若少数直流功率单元5的输出功率与大多数直流功率单元5的输出功率之差超出设定范围,例如10W,则让对应的少数直流功率单元5投入运行,追踪最大功率点,而其他直流功率单元5仍然不工作。同时,主控制单元根据总体输出功率大小以及各个交流功率单元4的工作时间,指示部分交流功率单元4停止运行。当判定没有阴影时,主控制单元指示正在工作的直流功率单元5停止工作,以及指示各个交流功率单元4的运行与停止。当一段时间内光照强度很弱时,主控制单元指示所有直流功率单元5和交流功率单元4停止工作,不再向电网或负载输送能量。当一段时间内光照强度变强时,重新进入启动阶段。In the start-up phase, all DC power units 5 are not working, and all AC power units 4 are put into operation. After waiting for a few minutes, the system enters the normal working stage. At this time, the main control unit determines whether the shadow exists according to the output power of each DC power unit 5 . The basis for judging is that if the difference between the output power of a few DC power units 5 and the output power of most DC power units 5 exceeds the set range, for example, 10W, the corresponding few DC power units 5 are put into operation to track the maximum power point, and Other DC power units 5 still do not work. At the same time, the main control unit instructs some AC power units 4 to stop running according to the overall output power and the working time of each AC power unit 4 . When it is determined that there is no shadow, the main control unit instructs the working DC power unit 5 to stop working, and instructs each AC power unit 4 to run and stop. When the light intensity is very weak for a period of time, the main control unit instructs all DC power units 5 and AC power units 4 to stop working and no longer transmit energy to the grid or loads. When the light intensity becomes stronger for a period of time, re-enter the start-up phase.
本发明的电路结构既可以解决光伏阵列的部分阴影问题,也可以降低开关电路本身工作带来的功率损失,提高系统效率,同时也提高了整个系统的可靠性。采用模块化设计,因此在安全冗余度方面,还是安装维护等方面,与以往电路结构相比,都具有非常好的优点。本发明的电路结构可用于光伏发电并网系统或离网系统,既适用于单相交流系统,也适用于三相交流系统,在大中功率光伏发电领域具有非常好的实用价值。The circuit structure of the present invention can not only solve the partial shadow problem of the photovoltaic array, but also reduce the power loss caused by the operation of the switching circuit itself, improve the system efficiency, and improve the reliability of the whole system at the same time. It adopts modular design, so it has very good advantages in terms of safety redundancy and installation and maintenance compared with the previous circuit structure. The circuit structure of the present invention can be used in photovoltaic power generation grid-connected systems or off-grid systems, suitable for both single-phase AC systems and three-phase AC systems, and has very good practical value in the field of large and medium power photovoltaic power generation.
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