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Analysis on current situation and future trend of photovoltaic inverter in 2015

View times:2721  Author:admin  Published time:2016-8-19

Now the application of inverter is divided into four, one is the desert power plant, there are some hills, ponds and so on some of the additional use of land, the third is the industrial and commercial roofing, the last is the family power station. The scale of these power plants is gradually decreasing, and the scale of the desert hydropower station is the largest, and the family is mainly below 40 million. From four application shows, over the past few years now the photovoltaic inverter technology development is very fast, the classification above appeared in these four forms, the first is the so-called centralized inverter and give its definition is the PV module massive series parallel after centralized inverter fed into the grid. String inverter is for each string photovoltaic compile inverter fed into the grid, micro for every piece of PV inverter independent fed into the grid, power optimization is per formed by DC summary.
Technology status, specific performance, photovoltaic inverter is highly dependent on in the development of power electronics and microelectronics technology, if there is no new power device, no new type of semiconductor devices, if there is no superior performance of high speed microprocessors, the inverter is not to achieve higher performance, mainly focuses on how to improve the PV modules, photovoltaic phalanx of operation efficiency, reduce loss, improve reliability, and the entire PV other PID and so on and block the dust and so on, the inverter itself, focusing on how to reduce the loss of self and improve equipment reliability. Commonly used more complex control technology, as well as some of the modern control algorithm. Now is also the basic focus on how to improve the security of power grid, friendly, and to provide some intelligent services and technology. Now technology around these five also made a lot of innovation, doing a lot of work, photovoltaic inverter is like a bridge between our renewable energy and power grid, to do the work of the bridge.
The current level of technology, the conversion efficiency to achieve 97% to 99%, the MPPT efficiency achieve 98% to 99.9%, the single largest power now 2.5 MW, circuit structure mainly at present is to two level mainly small amount of three-level and cooling wind edge, a small amount of self cooling, liquid cooled, in power device IGBT as main, a small amount of silicon carbide devices, in support of the Ministry recently silicon carbide devices made some breakthrough. Now the voltage level is less than 1000 volts.
Industry situation, the current is still the SMA is the world's leading inverter boss, ABB acquired Power-One, is currently second. Sunshine inverter shipments last year, is the world's second, but shipments, but the amount of sales in a row on the top five are not up, because we sell too cheap.
The application of inverter is changed along with the change of the inverter, string inverter good, a micro inverter or, large inverter or, in the global market basically or certain commonalities, is more than a certain power in general is equipped with a large inversion equipment, in the Chinese market are due to a large number of large power plant, is mainly dominated by centralized inverter, string inverter development is relatively fast.
Inverter applications, with the expansion of the scale, it's not only did not decline in the proportion of its power level is still rising, the current main models are about 1 MW, there is a single and parallel. String inverter, the current situation is string inverter is developing very fast, is particularly suited for use in small and medium projects, especially the roof, hillside, family cable and so on, the biggest advantage in cloudy weather, we grid connected photovoltaic power station which provides power rate of the rise in the rate, rate of rise can be controlled, through the regulation of the inverter can the power limit, so the rate of rise is can limit.
Photovoltaic inverter also has a safety performance, first of all, safety is PID, all components manufacturers say PID got the certification. Get the certification does not mean that there is no PID, but PID than others better. Department of animal in here for everyone to cite an example, in a winery, wine, installed above the 10 megawatt solar power, after burning up the wine, steam, wine is acidic substances, the top of the solar power station must penetrate into the. Finally, this power plant failure, failure to what extent it, half of the power is not, so that the loss of who is going to bear. There is leakage, leakage how to do. Last one is on fire, DC is not easy to catch fire, the future a large number of distributed in use, the family on the roof or precious inside the workshop on top of the fire, now has such a thing, several pieces, how do estimated as our electric automobile fire the same, I will back five years, all parties to condemn us, we start to to do the work, to pull arc detection of arcing. Start when we can detect, turn it off, so it will not fire.
With the rapid development of inverter technology, centralized inverter to develop in the direction of bigger, string inverter to more convenient, more secure, more intelligent direction of development, the future our equipment inverter equipment will be more focused and to improve its efficiency and reliability, also provided for the power grid, such as smoothing, reactive power, through the support, emergency and other friendly service. PV power plant types are increasingly complex, diverse, so the actual situation of different types of power plants need to be adapted to local conditions, scientific design, reasonable choice of inverter equipment.

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