Direct-current boost concentrated inversion photovoltaic power generation system

Abstract

The invention relates to a direct-current boost concentrated inversion photovoltaic power generation system. The photovoltaic power generation system comprises a control unit, multiple direct-current boost power generation units and a concentrated type inverter, wherein each direct-current boost power generation unit comprises direct-current input branches, a direct-current boost cabinet and a DC-DC apparatus; the number of the direct-current input branches is not less than two; the output ends of the multiple direct-current input branches are connected to the input end of the direct-current boost cabinet in parallel; the output end circuits of the multiple direct-current input branches are connected in series in the direct-current boost cabinet; the output end of the direct-current boost cabinet is connected to the input end of one corresponding DC-DC apparatus by a loop; the direct-current cables connected with the output ends of the corresponding DC-DC apparatuses of the respective direct-current boost power generation units are connected in parallel respectively, and then are connected to the direct-current side of the concentrated type inverter; and the alternating current side of the concentrated type inverter is connected to a common medium-high-voltage alternating current power grid. The direct-current boost concentrated inversion photovoltaic power generation system is simple in configuration, low in investment, high in utilization ratio, low in line loss, low in cost, easy to maintain, and high in protection function.

Description

technical field [0001] The invention relates to the technical field of solar photovoltaic power generation, in particular to a DC step-up centralized inverter photovoltaic power generation system. Background technique [0002] Energy is an important material for economic and social development and improvement of people's lives. Energy issues are the key to a country's development. With the increasing scale of photovoltaic power generation, photovoltaic production capacity is no longer limited to supplementary energy, but is moving towards the direction of alternative energy. However, due to the unbalanced distribution of economic development and renewable resources, the distance span between my country's energy centers and load centers is very large. The region is concentrated in the eastern coastal areas; at the same time, solar power generation requires additional peaking capacity provided by the grid, but the peaking capacity in remote areas in the northwest is insufficie...

AI Technical Summary

Problems solved by technology

In this solar photovoltaic power generation system, a low-voltage transmission line is used between the photovoltaic modules and the transformer, resulting in too long low-voltage transmission lines and excessive line losses; and each group of photovoltaic modules corresponds to an inverter and a transformer, and multiple photovoltaic modules need Multiple inverters and multiple transformers have complex structures, large investment, and low utilization rate; and the lines from multiple combiner boxes to transformers in the existing solar photovoltaic power generation system adopt a general series connection method, that is, combiner boxes and combiner boxes The boxes are connected in series two by two outside the transformer. When the system breaks down, it is necessary to overhaul the circuit components of the whole system, which is not easy to operate.

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