光伏并网发电系统是由光伏组件、电池方阵、汇流箱，逆变器，交流配电柜（并网柜）、变压器等设备组成。其部分设备的作用是：

　　The photovoltaic grid connected power generation system is composed of photovoltaic modules, battery arrays, combiner boxes, inverters, AC distribution cabinets (grid connected cabinets), transformers and other equipment. The function of some of its devices is to:

　　光伏组件

　　Photovoltaic modules

　　在有光照（无论是太阳光，还是其它发光体产生的光照）情况下，电池吸收光能，电池两端出现异号电荷的积累，即产生“光生电压”，这就是“光生伏特效应”。在光生伏特效应的作用下，太阳能电池的两端产生电动势，将光能转换成电能，是能量转换的器件。太阳能电池一般为硅电池，分为单晶硅太阳能电池，多晶硅太阳能电池和非晶硅太阳能电池三种。

　　In the presence of light (whether from the sun or other luminous sources), the battery absorbs light energy and accumulates opposite numbered charges at both ends, resulting in the generation of "photovoltaic voltage", which is known as the "photovoltaic effect". Under the action of the photovoltaic effect, the two ends of a solar cell generate electromotive force, which converts light energy into electrical energy, making it an energy conversion device. Solar cells are generally silicon cells, divided into three types: monocrystalline silicon solar cells, polycrystalline silicon solar cells, and amorphous silicon solar cells.

　　组件方阵

　　Component array

　　单块的光伏组件不能够形成足够的电压用来发电，必须有一定数量的光伏组件进行串联，形成足够的电压。这个电压一般在200~1000V。

　　A single photovoltaic module cannot generate sufficient voltage for power generation, and a certain number of photovoltaic modules must be connected in series to form sufficient voltage. This voltage is usually between 200 and 1000V.

　　光伏直流汇流箱

　　Photovoltaic DC combiner box

　　在太阳能光伏发电系统中，为了减少太阳能光伏电池阵列与逆变器之间的连线使用到汇流箱。用户可以将一定数量、规格相同的光伏电池串联起来，组成一个个光伏组串，然后再将若干个光伏组串并联接入光伏汇流箱，为了提高系统的可靠性和实用性，在光伏防雷汇流箱里配置了光伏专用直流防雷模块、直流熔断器和断路器等，还可以加装监控功能模块方便用户及时准确的掌握光伏组件的工作情况，保证太阳能光伏发电系统发挥最大功效。

　　In the solar photovoltaic power generation system, a combiner box is used to reduce the connection between the solar photovoltaic cell array and the inverter. Users can connect a certain number and specifications of photovoltaic cells in series to form photovoltaic strings, and then connect several photovoltaic strings in parallel to the photovoltaic combiner box. In order to improve the reliability and practicality of the system, photovoltaic dedicated DC lightning protection modules, DC fuses, circuit breakers, etc. are configured in the photovoltaic lightning protection combiner box. Monitoring function modules can also be installed to facilitate users to timely and accurately grasp the working condition of photovoltaic modules, ensuring that the solar photovoltaic power generation system can play its maximum role.

　　逆变器

　　inverter

　　是将直流电转换成交流电的设备。由于光伏组件方阵是直流电源，而负载是交流负载时，逆变器是必不可少的。逆变器按运行方式，可分为独立运行逆变器和并网逆变器。独立运行逆变器用于独立运行的太阳能电池发电系统，为独立负载供电。并网逆变器是用于并网运行的太阳能电池发电系统。

　　It is a device that converts direct current into alternating current. Due to the fact that the photovoltaic module array is a DC power source and the load is an AC load, an inverter is essential. Inverters can be divided into independent operating inverters and grid connected inverters according to their operating modes. The independent operation inverter is used for a solar cell power generation system that operates independently and supplies power to independent loads. Grid connected inverter is a solar cell power generation system used for grid connected operation.

　　交流配电柜（并网柜）

　　AC distribution cabinet (grid connected cabinet)

　　作为光伏电站的总出口存在于光伏系统中，是连接光伏电站和电网的配电装置，其主要作用是作为光伏发电系统与电网的分界点。对于低压并网的光伏电站，光伏并网柜中还可以加装计量、保护等功能器件。

　　As the total export of photovoltaic power plants, it exists in the photovoltaic system and is a distribution device that connects the photovoltaic power plant and the power grid. Its main function is to serve as the boundary point between the photovoltaic power generation system and the power grid. For low-voltage grid connected photovoltaic power plants, metering, protection and other functional devices can also be installed in the photovoltaic grid cabinet.

　　监控系统

　　monitoring system

　　光伏发电系统，在维护过程中可以配置监控系统，有助于提高运行的可靠性，及早进行维护工作，提高发电的效率。变压器变压器一般都是升压变压器，它将光伏逆变器所逆变出来的交流电，通过升压达到并网电网的电压等级。

　　The photovoltaic power generation system can be equipped with a monitoring system during maintenance, which helps to improve the reliability of operation, carry out maintenance work early, and improve the efficiency of power generation. Transformers are generally boost transformers, which convert the AC power inverted by photovoltaic inverters into voltage levels that are connected to the grid through boosting.

　　变压器

　　transformer

　　应该具有隔离功能。一般变压器位于并网交流柜的前段（从电流流向上看，在光伏系统中，电流是从逆变器流向电网）

　　It should have isolation function. Generally, the transformer is located in the front section of the grid connected AC cabinet (from the perspective of current flow, in a photovoltaic system, current flows from the inverter to the grid)

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