逆變器作為光伏電站的電能轉(zhuǎn)換設(shè)備，在整個電站中占據(jù)著舉足輕重的地位。光伏逆變器是將組件產(chǎn)生的低壓直流電轉(zhuǎn)換為交流電的電力電子設(shè)備，接入負載或者并入到電網(wǎng)中，是光伏系統(tǒng)中的核心器件。并網(wǎng)逆變器有以下的主要功能：

就產(chǎn)品類型而言，目前逆變器產(chǎn)品主要分為四類，即：

微型逆變器可對系統(tǒng)中每塊組件進行逆變并進行獨立的MPPT控制，能夠大幅提高整體效率，同時也可以避免傳統(tǒng)逆變器具有的直流高壓、弱光效應(yīng)差、木桶效應(yīng)等。

昱能科技微型逆變器系統(tǒng)優(yōu)勢視頻

可以就近安裝在某一串組件下方，采用固定支架安裝或采用抱箍式安裝直接將設(shè)備固定在立柱上。這種方案需要注意支架和抱柱強度及光伏逆變器離地高度，防止放置太低在暴雨天雨水淹沒設(shè)備。

大型工商業(yè)屋頂一般屋頂空曠，無頂棚和女兒墻，光伏逆變器可懸掛之處，出于減少線纜成本的考慮，一般都需要自制安裝支架，并將逆變器懸掛在自制支架上，支架需考慮逆變器承重和固定形式以及在沿海地區(qū)抗臺風(fēng)能力。

光伏逆變器盡量安裝在南邊的墻上，其面板要朝北，少曬太陽。機器的安裝離地面要有合適的高度，以便觀察和讀取LED的顯示。 室外安裝時，逆變器上面要裝防雨防曬棚，避免陽光直射和雨水浸泡。

微型逆變器可直接安裝在組件下方的支架上，或與組件集成實現(xiàn)模塊化設(shè)計、實現(xiàn)即插即用。微逆體積小，基本不獨立占用安裝空間，分布式安裝便于配置，能夠充分利用空間和適應(yīng)不同安裝方向和角度的應(yīng)用。

As the power conversion equipment of photovoltaic power station, inverter occupies a pivotal position in the whole power station. Photovoltaic inverter is a power electronic device that converts low-voltage direct current generated by the module into alternating current. It is connected to the load or incorporated into the power grid. It is the core device in the photovoltaic system. Grid-connected inverter has the following main functions:

The direct current generated by photovoltaic modules is converted to alternating current

Through the maximum power tracker, the maximum power point (MPP) is dynamically found and utilized to maximize the available power

Recording Running Data

Provide current, voltage and local grid protection

02

What are the classification of inverters?

In terms of product types, inverter products are mainly divided into four categories at present, namely:

Centralized inverter (power range: 250KW-10MW, mainly used in large ground power stations)

Distributed inverter (power range: 1MW-10MW, mainly used in complex large ground power stations)

Cluster series inverter (power range is 1.5KW-250KW, mainly used for household, industrial and commercial distributed and ground power stations, etc.)

Micro inverter (power range is generally below 4kW, mainly used in distributed small and medium-sized power stations. Based on the consideration of photovoltaic safety, it is more and more applied to large industrial and commercial distributed power stations.)

The micro inverter can invert each component in the system and carry out independent MPPT control, which can greatly improve the overall efficiency, but also avoid the traditional inverter some DC high voltage, poor light effect, barrel effect, etc.

Watch the following video to learn more about micro inverters.

Renesola micro inverter system advantages video

03

Where is the installation position of the inverter?

Common installation schemes for distributed ground projects

It can be installed nearby under a string of components, and the device can be directly fixed to the column by using a fixed bracket installation or hoop installation. This scheme needs to pay attention to the strength of the support and holding column and the height of the photovoltaic inverter from the ground, so as to prevent the equipment from being placed too low in heavy rain days.

Large industrial and commercial plant installation program

Large industrial and commercial roofs are generally empty, without roofs and parapets, where photovoltaic inverters can be suspended. For the purpose of reducing cable costs, it is generally necessary to install self-made supports, and hang the inverters on the self-made supports. The supports need to consider the bearing and fixed forms of the inverters and the resistance to typhoon in coastal areas.

Common household distributed project rooftop power station installation scheme

The photovoltaic inverter should be installed on the south wall as far as possible, and its panel should face north to avoid sunshine. The machine should be mounted at a suitable height above the ground for viewing and reading the LED display. For outdoor installation, the inverter must be equipped with a rain-proof sunscreen shed to avoid direct sunlight and rain.

A system using miniature inverters

The micro inverter can be directly installed on the bracket below the component, or integrated with the component to achieve modular design and realize plug and play. The micro inverse has a small volume and does not occupy the installation space independently. Distributed installation is easy to configure, and can make full use of space and adapt to different installation directions and angles.