Classification of Photovoltaic Power Station Characteristics
Author: Source: Datetime: 2016-10-11 10:42:39
Hill power station: the use of mountain, hills and other resources to develop photovoltaic power plants. The size of such power plants vary from a few MW to hundreds of MW range; power generation to incorporate high-voltage transmission network-based; affected by the terrain, many components are inconsistent or sooner or later obscure the problem. This type of power station is mainly used in mountainous areas, mines and a large number of wasteland can not be planted.
Desert power station: the use of broad flat desert ground resources development of solar power generation station. The type of power station scale, usually greater than 5MW, the current single-scale above 50MW power station has been very common; power plant inverter output after boosting directly into the 110KV, 330KV or higher voltage high-voltage transmission network; in a flat terrain , The price of PV modules towards a solar PV module, no shelter. This type of power station is the main force of China's photovoltaic power station, mainly concentrated in the western region.
Rooftop power plant: the use of plant, public buildings, residential and other roof resources development of photovoltaic power station. The type of power station size is limited by the effective roof area, the installed capacity is generally in the range of several kilowatts to tens of megawatts; power plant drum solar street lighting need to be local power consumption, directly into the low-voltage distribution network or 35KV and below the high- ; Component orientation, inclination and shading occlusion diversification. This type of power station is the main form of distributed PV applications, mainly in the eastern and southern regions of China many home use solar powered portable generator.
Inverter classification and characteristics
According to its power level, internal circuit structure and application, photovoltaic inverter can be divided into three types: centralized inverter, string inverter and micro-inverter.
Group string inverter: single power between 3-60KW. Main models Single machine power 30-40KW, single or multiple MPPT, generally 6-15KW all the way MPPT. This kind of inverter has higher cost per watt, which is mainly used in small and medium-sized power plants, and the selection rate is more than 50% in the power plant with the capacity below 1MW.
Centralized inverter: the main features of single power, the maximum power tracking (MPPT) a small number of low cost per watt. At present the mainstream models to 500KW, 630KW mainly in Europe and North America and other regions of the mainstream models 800KW or even higher single power, power level and integration is also rising, SMA, Germany this year launched a stand-alone power 2.5MW of the inverse . In accordance with the inverter main circuit structure, centralized inverter can be divided into the following two types: centralized outdoor solar street lamp inverter is the most large-scale photovoltaic power plant of choice of solar power batteries, in the world more than 5MW of photovoltaic power plants, The selection ratio of more than 98%.
Micro-inverter: single power below 1KW, single MPPT, the application of 0.25-1KW all the way to MPPT, the advantage of each block or a few panels can be independent MPPT control, but the inverter per watt High cost. At present in the North American 10KW following the family of photovoltaic power plants have more applications.
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