Multi-path MPPT micro inverter and control method thereof

Abstract

The invention discloses a multi-path MPPT micro inverter and a control method thereof. The method specifically comprises the following steps: respectively tracking and extracting the maximum power point of each independent solar cell panel in N independent solar cell panels; meanwhile, coordinating and distributing the output power of each independent solar cell panel according to the extracted maximum power such that a multi-level mode is formed, summarizing the extracted N paths of maximum power, boosting the summarized voltage, rectifying, filtering and performing phase conversion on the boosted voltage in sequence to obtain current and voltage meeting power grid requirements, and inputting the current and the voltage into a grid, wherein N is a positive integer greater than or equal to2. The inverter is small in size and low in cost, can effectively track the maximum power point of multiple solar cell panels in real time, and can reduce filtering parameters while improving the efficiency of the whole machine, thereby generating current and voltage meeting the requirements of the power grid.

Description

technical field [0001] The invention belongs to the technical field of inverters. Background technique [0002] As the cleanest renewable energy, solar energy will become the best energy source to support future global economic growth. However, the cost of photovoltaic power plants is still higher than that of other forms of power plants. Many governments have to rely on complements to promote the development of the photovoltaic industry. Therefore, improving the conversion efficiency of photovoltaic power plants and adopting new technologies to greatly reduce the overall cost of photovoltaic power plants is the only way to finally promote the commercialization of photovoltaic power generation. [0003] The first connection method is as figure 1 As shown, the solar photovoltaic system is composed of many closely connected solar panels. These battery panels are first grouped and connected in series, and then different series connected battery groups are connected in paralle...

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Problems solved by technology

[0008] Purpose of the invention: In order to solve the problems of large size, high cost, inability to track the maximum power points of multiple channels effectively in real time, and the inability to redistribute the power of each photovoltaic cell group, resulting in increased loss of power tubes, etc. in the prior art, The invention provides a multi-channel MPPT micro-inverter and its control method

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