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Under the stimulation of the continuous favorable policies of domestic photovoltaics, the construction sites of photovoltaic power stations slowly spread to the relatively light-illuminated Class II and Class III regions. Several provinces, such as Shandong, Shanxi, Hebei, and Yunnan, have successively launched power generation projects for photovoltaic power plants on a large scale, becoming new PV “new†provinces.
For the consideration of comprehensive investment costs, most of the photovoltaic power plant projects are in the mountains. The terrain of the mountainous terrain is uneven and the depth of the hard layer varies, making it difficult to maintain the same orientation of the photovoltaic panels.
The complexity of the terrain makes construction difficult on the one hand, but more importantly, the problem of PV array parallel mismatch caused by the inconsistent orientation of photovoltaic panels can not fully exert the power generation capacity of photovoltaic modules and lose power generation.
Hopefully, this problem has been known for several years and has been looking for a solution to this problem. In 2013, we hoped to launch the hub-and-spoke solution to solve this problem.
The distributed solution means that the MPPT function and DC/DC boost are added on the basis of the traditional combiner box. On the one hand, one MPPT tracking is performed for every two strings, and on the other hand, the output of the combiner box is boosted. Access to the inverter reduces long-distance transmission losses from the combiner to the inverter.
Due to the PV characteristics of PV modules, the deformation of the MPPT curve caused by inconsistent components (multiple peaks appear), and the impact on power generation is enormous.
(The following figure shows that the single-channel MPPT results in two peaks, which will be lost regardless of which highest point is tracked. However, if two MPPTs are tracked as in the figure above, this problem is avoided)
The distributed solution implements one MPPT for every two strings, enabling fine tracking of the maximum power point of the PV modules. From the field application of practical statistics, each square array can generate 3% more power than a centralized solution.
(Figure: The actual power generation data of a photovoltaic power plant on-site monitoring from September to June of the following year, and the distributed scheme can generate about 3% more power than the centralized scheme)
At present, the prospective collection and distribution inverter program has been widely recognized by the market, and its photovoltaic project in the mountains is generally welcomed. Has entered a number of major domestic power generation groups, in Yunnan, Liaoning, Shandong, Shanxi, Shaanxi, Jiangsu, Zhejiang, Hunan, Hubei, Hebei, Henan and other provinces have the hope of the concept of a collection and distribution program, also got in the reliability The market has been fully verified, and multiple power station monitoring of power generation data shows that at least 3% of the power generation is increased compared to the centralized solution.
summary
The regions with good lighting resources in China are basically distributed in northwest China. Investors who have caught up in the early days have already occupied almost the same resources in areas with good lighting resources, plus severe power cuts in the northwestern region. This has greatly affected the investment income of investors. Although the lighting conditions in the northwest region are good, they still have There are many investors who are not very willing to invest in PV power plants. Due to the strong support of the current domestic photovoltaic policy, in the II and III regions where light resources are not so good, the photovoltaic power station projects have also been launched. However, Class II and Class III projects are well-lighted and cost-effective in all areas, especially in the mountains.
The topography of the mountainous terrain is characterized by unevenness of the ground. It is difficult to achieve the same orientation angle of the PV array panels in the construction of the project. This leads to the problem of the parallel mismatch of the PV arrays becoming increasingly prominent. The distributed inverter scheme achieves multi-channel MPPTs (hopefully achieving 1 MPPT per 2 clusters), and solves the serious parallel mismatch problem caused by the characteristics of mountainous regions.
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