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The main reason for the choice in photovoltaic inverter series

According to IHS, according to the results of a survey over 300 solar installer, distributors and EPC company said more and more tend to adopt the string type inverter. About 80% of buyers say they could apply string type inverter to scale greater than 100 kw system. Nearly half of the surveyed

according to a survey of IHS, more than 300 solar installer, distributors and engineering general contracting company, says they are increasingly using series inverter. About 80% of buyers say they may be used in the system of 100 kw or more series inverter. Nearly half of respondents say they are considering is greater than 1 mw series inverter is used in the system, by contrast, 17% of the respondents think that last year. In addition, buyers said that about 40% of the inverter series inverter is suitable for the installed capacity is greater than 1 mw photovoltaic projects. Photovoltaic market, a senior analyst at IHS gilligan ( 吉利根) Said: 'the investigation confirmed that in the past year, large-scale system for the acceptance of the series inverter has been on the rise, reflecting the IHS these products is expected to gain market share in a few key photovoltaic market. Solar buyers prefer series inverter in large-scale system rather than the central inverter is one of the most common reason is that the former on the system design more flexible, and can minimize the loss. Reason 1: 'series inverter adopts the modular design. A inverter for photovoltaic series items. DC side has the most power tracing function, communication terminal to the power grid in parallel. Its advantage is not affected by series inverter module between the mask and differences. At the same time, it reduces the photovoltaic modules and inverters of mismatch between the best working point, and maximize the capacity. First of all, avoid concentrated barrel effect of frequency conversion power station ( As shown in the figure below) 。 In a centralized grid inverter system, element array by two inverter bus-bar arrived. The most power tracing function of inverter, MPPT) Cannot monitor every part run, it is impossible to make every component in the best working point. When a component failure or obscured, the efficiency of the whole system will be affected. Therefore, when the battery components are blocked, centralized power stations will be badly affected, only a series of MPPT and blocking a series of power stations should be relatively will be affected. However, under normal circumstances, the components are installed between the distance and Angle is different, within a certain time of day will inevitably occur local blocking, especially when the high Angle of the sun in the morning and evening is low, or some vegetation covers some batteries for a little while. If a piece of 500 kilowatts of square panels is a MPPT tracking, a certain amount of electricity will be a loss. It is also applicable to the battery components of dirt, shadow, aging, temperature rise and hot spots. Secondly, using the series inverter power station can be used in the same project components in different directions. In mountainous area in the project, for example, because of the complex terrain of the region, flat land is small, so can't leveling the land, and south of terrain is limited. Therefore, in order to guarantee the capacity, must make full use of the southeast and southwest slope and slope. At this point, the installation of the panels direction can't fully toward the south. If a piece of 500 kilowatts of square panels is a MPPT tracking, a certain amount of electricity will be a loss. Third, using series inverter power plant can use different types of components in the same project, it in traditional centralized inverter power station could not be achieved. Reason two: series inverter has low power consumption, small fault effect, change of the advantages of convenient maintenance. Centralized inverter consume a large amount of electricity, machine room ventilation heat consume large amounts of electricity. System maintenance is relatively complex. One thousand fails, the whole plant will be paralyzed. If series inverter group of malfunction, there is only one series parts will stop to produce electricity. The whole plant can be run as usual, thus greatly reducing the loss. In addition, the invention of small volume, light weight, very easy to carry and install, no need professional tools and equipment, do not need special transformer room, can simplify construction, reduce all kinds of application area, DC circuits connecting don't need DC female head, DC distribution cabinets, etc. This means that the series inverter set of maintenance cycle than centralized inverter maintenance cycle is short. The diagram below shows the centralized inverter and series inverter set of maintenance period. Above two reasons should choose a set series inverter is the most common reason, but its advantage is not limited to this. Flexible Internet monitoring scheme can make, for example, use the group series inverter power station accurately monitor panel in each group, are more likely to find the fault components, and real-time control panel details in each group, and history. As the technology mature and the change of the market, the cascaded inverter has more advantages, series power station will be used widely in the world.

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