Photovoltaic (pv) grid inverter overview and classification have?

Photovoltaic inverter is applied in the field of solar photovoltaic power generation dedicated inverter, grid inverter is the pv cells and grid interface device, generally divided into grid-connected photovoltaic (pv) grid inverter, wind power inverter, power equipment grid inverter and other power equipment grid inverter. Photovoltaic inverter will solar cells produce direct current by converting power electronic transformation technology can directly exchange energy grid, load. Core components is indispensable in a photovoltaic system. As photovoltaic (pv) grid inverter battery and power network interface device, the photovoltaic battery power into ac power and transmission to the power grid, the photovoltaic (pv) grid power system plays a vital role, modern inverter technology to the development of photovoltaic (pv) grid power provides a strong technical and theoretical support. Inverter grid-connected photovoltaic (pv) grid inverter is generally divided into grid-connected photovoltaic (pv) grid inverter, wind power inverter, power equipment grid inverter and other power equipment grid inverter. Due to the diversity of the building, it is bound to lead to the diversity of solar panel installation, in order to make the highest conversion efficiency of solar energy at the same time balancing the beautiful shape of buildings, which requires the diversification of our inverter, to realize the best way to solar energy conversion. Now very popular in the world of solar inverter for: centralized inverter, group, series inverter, inverter multiple sets of series of inverter and component. Centralized inverter centralized inverter and is commonly used in large-scale photovoltaic power station ( > 10千瓦) Parallel photovoltaic systems, many even to the same group of string is centralized inverter dc input, the use of the general power three-phase IGBT power modules, the use of smaller power field effect transistor, at the same time using DSP conversion controller to improve the quality of the output power, making it very close to the sine wave current. Biggest characteristic is the system of high power, low cost. But the pv group string matching and part of the covering film, lead to the efficiency and capacity of the whole solar system. At the same time, the whole pv system reliability of generating a photovoltaic cell set of adverse effects of work status. The latest research direction is using space vector modulation control, as well as the development of new inverter topology connection, to get part of the load cases of high efficiency. Group series inverter series inverter has become now the most popular in the international market of inverter. Set series inverter is based on a modular concept, on the basis of each photovoltaic string ( 1 kw - 5千瓦) Through an inverter, the dc side peak with maximum power tracking, parallel interconnection on the ac side. Many large photovoltaic power plant using group series inverter. Advantage is not affected by group module differences between string and covering film, at the same time reduce the best point of photovoltaic modules and inverters don't match case, thus increasing the electricity. These advantages in the technology not only reduces the system cost, and increase the reliability of the system. At the same time, introduced between group list '- Lord From 'concept, make the system work in a single string of electricity can't make a single inverter, string together, several pv group to make one or several, to produce more electricity. The latest concept for several inverter together form a 'team' instead of 'master - From the concept of 'make the reliability of the system a step closer. At present, the group without transformer type series inverter has occupied dominant position. Multiple sets of series inverter multiple sets of series inverter is to take the advantages of centralized inverter and group series inverter, avoid its shortcomings, can be applied to a few kilowatts of photovoltaic power station. In multiple sets of series inverter, contains a different single peak power tracking and dc to dc converter, the dc by a common dc to ac inverters convert alternating current (ac), interconnection to the grid. Photovoltaic (pv) set of strings of different rating ( Such as: different power rating and quantity of each string of different groups, components, different manufacturers, etc. ) Pv modules, different size or different technology, different direction of set of string ( Such as: east, south and west) , different Angle or shadow, can be even on a common inverter, at the same time each set of string work in their respective peak on the maximum power. At the same time, the length of the dc cable to reduce, string between groups to cover the shadow effect, and due to the difference between the set of string and cause to minimize the loss. Components inverter inverter is to each of the pv modules connected to an inverter, at the same time, each component has a single peak maximum power tracking, such components and the inverter with the better. Is often used to 50 w to 400 w solar power station, the total efficiency is lower than the group series inverter. Because it is in the communication in parallel, which adds to the complexity of the ac side of the attachment, maintenance difficulties. Another need to solve is how to more effectively and the power grid interconnection, a simple method is to directly through the ordinary ac socket grid, so that it can reduce the cost and equipment installation, but usually around the grid safety standards may not be allowed to do so, the power company is likely to oppose power generation device directly connected to normal home users of the normal socket. Another related and safety factor is whether need to use the isolation transformer ( High frequency or low frequency) No transformer, or allow the use of inverter. The inverter solar grid inverter in glass curtain wall of photovoltaic (pv) grid inverter in the most widely used.
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