In the blink of an eye, 2017 has already come. Looking back at the 2016 PV market, it was a good show, from the 630 PV surge rush to the fierce competition of the leading group photovoltaic project major groups, at this time the largest part of the PV power input costs (photovoltaic cells The price of the board fell below 4 yuan/W. At the end of September, the National Development and Reform Commission issued the “Circular on Adjusting the On-grid Tariff of New Energy Benchmarks (Draft for Solicitation of Comments)â€. After this draft was issued, relevant departments also convened the owners, general contractors, and upstream equipment manufacturers to discuss together. Reduce the on-grid tariffs of PV (photovoltaic ground power tariffs fall between 23.5% and 31.2%, and distributed power subsidies fall between 28.6% and 52.4%). 2016 is a busy year. Judging from its frequently introduced policies, there will be a new protagonist in the 2017 PV market, which is “PV helps the poor.â€
PV Poverty Reduction Policy
PV Poverty Alleviation, as one of the “Ten Precision Poverty Alleviation Projects†determined by the State Council Poverty Alleviation Office in 2015, took full advantage of the abundant solar energy resources in poverty-stricken areas, and realized the development of poverty alleviation through the development of solar energy resources and the stable income generated for 25 consecutive years. The combination of new energy use, energy saving and emission reduction has to be said to be an open and innovative approach to poverty alleviation. Relevant departments have issued support policies for photovoltaic poverty alleviation in recent years.
“Photovoltaic alleviation is a precise way of helping the poor.†According to Ou Qingping, deputy director of the State Council’s Office for Poverty Alleviation, using photovoltaic power to help the poor get out of poverty is one of the most effective ways. From the above table, we can see that the country's policy support for PV poverty alleviation has been brewing from 2014 to 2016. The policy has continued to increase and the policy has continued to increase. Implementation details continue to be introduced. It is believed that in 2017, PV poverty alleviation will be Such as the spring bath year.
PV Optimum Optimum Inversion Scheme
The main equipments of PV-powered poverty-relief power stations include photovoltaic modules, photovoltaic module mounting brackets, convergence boxes, inverters, cables, monitoring equipment, power distribution cabinets, and metering devices (provided by power supply companies). Although the inverter is not the largest initial investment, it is undoubtedly the core equipment in photovoltaic power plants. There are currently three different types of inverters on the market: centralized, string and distributed. So, which kind of inverter solution is suitable for photovoltaic poverty alleviation projects?
We consider the two dimensions of technology and investment costs.
First of all, technically. At present, there are three inverters in the market - centralized, string-type, and hub-and-spoke. Each has its own characteristics. It is difficult to compare the best and the poorest ones. The key is who is best suited to the engineering application scenario of photovoltaic poverty alleviation.
Most of the photovoltaic poverty alleviation projects are rooftop distributed or mountainous projects. Photovoltaic modules are deployed on the roof, which is consistent with the roof orientation. This can lead to severe parallel misfit loss. Although centralized inverters are representative of traditional inverters, they have a small number of MPPTs (a 500 kW inverter has a maximum of 4 MPPTs), and the parallel mismatch problem on large-scale flatland photovoltaic projects may not be obvious, but In the scene of roofs and mountains, the problem of loss of power generation caused by parallel mismatches is highlighted. In order to solve the problem of shunt mismatch, string-string and distributed inverter solutions emerged. Both the string-type inverter and the hub-and-spoke inverter scheme achieve one-channel MPP tracking for every two PV strings. The energy tracking density is greatly enhanced, the MPPT management is more refined, and the loss caused by the parallel mismatch is greatly reduced.
Compared with the string type and the hub type, the long-distance transmission of the string solution is the distance from the inverter to the box, and the transmission voltage is 480Vac. The long-distance transmission of the distributed solution is from the centralized convergence box to the inverter. Its transmission voltage is 800Vdc. Obviously, the distributed 800V long-distance DC transmission has a smaller transmission loss than the string 480V long-distance AC transmission. The distributed solution solves the parallel mismatch problem and reduces the long-distance transmission loss problem of photovoltaic power plants. It is the best choice.
summary
As stated in the article, for the PV poverty alleviation project, our goal is still to set the tone of “to spend less and work moreâ€. This is also a principle based on the optimal capital input and output. For the characteristics of photovoltaic poverty alleviation projects, both the technical and input costs are the best choices. Moreover, inverter manufacturers continue to explore the pain points and real needs of customers in the fierce market, and propose solutions that are more cost-effective and more relevant to customer needs. Looking forward to the introduction of a distributed, medium voltage pre-assembled inverter boost integrated solution by Electric, namely, the box transformer and the inverter are integrated in one container, and the inverter and the box are connected in the factory using bronze. When the container is transported to the site, it only needs to be lifted to the customer's simple foundation. It saves a lot of work (such as the cable connection from the box to the inverter, cable routing, etc.), and the construction is very convenient. Competitive solutions.
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